WATER

You can survive three weeks without food, three days without water, but only three hours without hope—and hope requires hydration.

Introduction

Water is the most critical resource after shelter. The human body is approximately 60% water, and virtually every physiological process depends on adequate hydration. Dehydration impairs physical performance, cognitive function, and thermoregulation. Severe dehydration kills.

Yet water also presents danger. Contaminated water harbors pathogens causing debilitating illness: bacteria (E. coli, Salmonella, Campylobacter), protozoa (Giardia, Cryptosporidium), viruses (Norovirus, Hepatitis A), and chemical pollutants. The challenge is obtaining sufficient clean water using available resources and knowledge.

This chapter addresses water comprehensively: locating natural sources, collecting precipitation, constructing improvised filters, purification methods (boiling, chemical, UV), and field assessment of water quality. We emphasize practical techniques achievable with minimal equipment whilst maintaining appropriate caution about waterborne illness.

Water Procurement: Finding and Collecting

Before purifying water, you must obtain it. Natural sources vary in accessibility, reliability, and contamination risk.

Natural Water Sources

Flowing Streams and Rivers:

Advantages:

• Usually abundant volume
• Movement provides some self-purification
• Easy to locate (follow terrain downhill)
• Often visible from distance

Considerations:

• Upstream contamination (livestock, human activity, dead animals)
• Varies with season and rainfall
• Glacial streams may contain harmful minerals/sediment
• Fast current can be dangerous

Collection technique: Wade in carefully (current stronger than appears), fill containers by submerging away from bank (cleaner water in flow). If possible, collect from rapids or turbulent sections (better oxygenated, fewer pathogens than still pools).

Springs and Seeps:

Advantages:

• Often cleaner than surface water (filtered through soil/rock)
• Consistent flow
• Cold temperature inhibits bacterial growth
• Less contamination risk than downstream sources

Identification:

• Wet ground where shouldn’t be
• Lush vegetation in dry area
• Water emerging from hillside
• Often marked by animal tracks (wildlife knows reliable sources)

Collection technique: Clear debris from source, allow sediment to settle, then collect. If flow is minimal, dig small basin to collect water before drawing.

Lakes and Ponds:

Advantages:

• Large volume (unlikely to run dry)
• Easy collection
• Usually accessible

Considerations:

• Standing water = higher contamination risk
• Organic matter decomposition
• Animal activity at edges
• Algae blooms in warm weather
• Insects breeding (mosquito larvae)

Collection technique: Wade out from shore if possible (sediment and contamination concentrate at edges). Collect from clearer, deeper water. Avoid areas with visible algae or scum.

Rainwater:

Advantages:

• Cleanest natural water source (if collected properly)
• Free of most pathogens
• No sediment
• Often abundant during storms

Collection methods:

• Lay tarp or poncho angled to drain into container
• Collect from clean surfaces (rocks, leaves)
• Use clothing to absorb and wring out
• Tie cloth between trees to funnel into container

Caution: First rain after dry period washes accumulated dust, pollen, bird droppings from collection surfaces. Let initial rain wash surfaces, then begin collecting.

Dew:

Collection methods:

• Absorbent cloth dragged through grass at dawn
• Wring out collected moisture into container
• Repeat until adequate volume

Yield: Labor-intensive. Expect 500ml per hour of work in optimal conditions. Emergency method only.

Plant Transpiration:

Technique:

1. Place clear plastic bag over leafy branch
2. Seal bag around branch base
3. Weight bag corner so water collects in low point
4. Wait several hours

Yield: Very small (maybe 100-200ml per day per bag). Requires abundant green vegetation and strong sunlight. Not practical for main water source but useful supplement.

Snow and Ice:

Considerations:

• Never eat snow directly (causes core temperature drop)
• Melting snow requires fuel (fire or stove)
• Yields much less water than volume suggests (10:1 ratio approximately)

Technique:

• Melt small amounts at a time (prevents burning container)
• Add small amount of water first if possible (prevents scorch)
• Compact snow before melting (increases density)
• Filter melted snow (often contains sediment)

Warning: Sea ice loses salt as it ages (first-year ice too salty, multi-year ice safer), but distinguishing ice age difficult without experience. Avoid sea ice unless confident in identification.

Signs of Water in the Landscape

Animal indicators:

• Game trails converging (likely heading to water)
• Bird flight paths (especially dawn/dusk)
• Insect swarms (near water sources)
• Animal tracks and scat

Plant indicators:

• Lush vegetation in otherwise dry area
• Willows, alders, cottonwoods (require water)
• Cattails, reeds, water-loving species
• Moss on north side of trees (indicates moisture)

Terrain indicators:

• Valleys and drainage (water flows downhill)
• Rock faces with seeps or staining
• Depressions in landscape
• Canyon bottoms

Listening: In quiet conditions, running water audible from significant distance. Stop, listen carefully, follow sound.

Filtration: Removing Particulates and Sediment

Filtration removes visible contaminants (sediment, debris, organic matter) and some microorganisms. Filtration alone does NOT reliably remove all pathogens and should be followed by purification.

Improvised Filtration Systems

Basic Cloth Filter:

Materials: Clean cloth (T-shirt, bandana, coffee filter if carried)

Method: Stretch cloth over container opening, pour water through slowly. Repeat with multiple layers if water very turbulent.

Effectiveness: Removes large particles, debris, insects. Does NOT remove bacteria, protozoa, or viruses. Minimal pathogen protection.

Tripod Filter (Millbank Bag Technique):

Construction:

1. Fill cloth bag (or fabric formed into bag) with filtering layers
2. Suspend from tripod or branch
3. Pour water into top, collect from bottom

Layering (bottom to top):

• Base: Fine cloth (prevents material escaping)
• Sand layer (fine): removes small particles
• Charcoal layer (crushed, from fire): removes some chemicals and improves taste
• Sand layer (coarse): larger particle removal
• Gravel layer: prevents clogging, preliminary filtering
• Grass/fabric: prevents top layers disturbing when pouring

Effectiveness: Significantly improves water clarity. Removes sediment, large protozoa cysts, and some taste/odor. Does NOT eliminate bacteria or viruses. MUST be followed by purification.

Lifespan: Charcoal and sand layers clog eventually (few liters to tens of liters depending on water turbidity). Disassemble, clean layers, or replace.

Water Bottle Filter (Improvised):

Construction:

1. Take plastic bottle, poke small holes in cap
2. Invert bottle (cap down)
3. Layer filtering materials (as above)
4. Pour water through

Advantage: Portable, individual capacity. Same limitations as tripod filter regarding pathogen removal.

Commercial Filtration

Pump Filters:

• Force water through micro-pore ceramic or hollow-fiber membrane
• Typically 0.2-0.3 micron pore size
• Removes bacteria and protozoa
• Does NOT remove viruses (too small)
• Adequate for backcountry use in developed regions
• Requires cleaning/backwashing periodically

Gravity Filters:

• Hang reservoir, gravity feeds water through filter into clean reservoir
• Same filtration media as pump systems
• Slower but less effort
• Good for camp/base use

Squeeze/Straw Filters:

• Small, portable, lightweight
• Adequate emergency capacity
• Same viral vulnerability as other filters

Limitations: All micro-filters eventually clog. Carry replacement or cleaning capability.

Purification Methods

Purification kills or inactivates pathogens. Multiple methods exist, each with advantages and limitations.

Boiling

Method: Heat water to rolling boil. At sea level, 1 minute boiling kills all pathogens. Add 1 additional minute per 1,000m elevation gain (boiling point decreases with altitude).

Advantages:

• 100% effective against all pathogens (bacteria, protozoa, viruses)
• No chemicals required
• No waiting time after boiling
• Simple, foolproof method

Disadvantages:

• Requires fuel (fire or stove)
• Time-consuming
• Uses pot/container
• Boiled water tastes flat (lacks dissolved oxygen—fix by pouring between containers)

Best practices:

• Bring to vigorous, rolling boil (not just steaming)
• Time from onset of rolling boil
• Allow to cool before drinking or transferring
• Don’t waste fuel over-boiling (1 minute adequate at low elevation)

Tip: If unsure about boil duration or altitude correction, err on side of longer boiling. Extra minute causes no harm.

Chemical Purification

Chlorine Dioxide (Aquatabs, Micropur):

Dosage: Follow product instructions (varies by brand and concentration)

Wait time: 15-30 minutes for bacteria/viruses, 4 hours for Cryptosporidium

Advantages:

• Lightweight and compact
• No taste if properly dosed
• Effective against all common pathogens (including crypto with extended time)
• Long shelf life

Disadvantages:

• Requires waiting time
• Effectiveness reduced in cold water
• Crypto requires very long wait (4 hours)

Best practices:

• Warm water if possible (works faster)
• Shake/stir to ensure dissolution
• Note time (don’t drink before complete)
• Store tablets in sealed, dry container

Iodine (Iodine Tablets, Tincture):

Dosage:

• Tablets: Follow package instructions
• Tincture: 5 drops per liter (2% tincture)

Wait time: 30 minutes (longer in cold water)

Advantages:

• Lightweight
• Long shelf life
• Inexpensive
• Effective against bacteria and viruses

Disadvantages:

• NOT effective against Cryptosporidium
• Bad taste (can be masked with drink mix)
• Extended use not recommended (thyroid concerns)
• Contraindicated for pregnant women, thyroid conditions
• Discolors water

Tip: Vitamin C tablet after iodine treatment neutralizes taste and clears discoloration.

Bleach (Unscented Household Bleach – Emergency Only):

Dosage: 2 drops per liter (5-6% sodium hypochlorite solution)

Wait time: 30 minutes

Critical warnings:

• Must be UNSCENTED, pure bleach (check ingredients)
• Must be fresh (degrades over time, losing effectiveness)
• Precise dosing important (too little = ineffective, too much = harmful)

Use only in emergency: Not ideal purification method but works when no alternatives exist.

UV Purification (SteriPEN and Similar)

Method: Ultraviolet light disrupts pathogen DNA, rendering them unable to reproduce.

Procedure:

1. Activate device
2. Stir in water for prescribed duration (typically 90 seconds per liter)
3. Wait for indicator (light/beep) confirming treatment
4. Water immediately safe to drink

Advantages:

• Fast (90 seconds)
• No chemicals or taste change
• Effective against all pathogens
• Reusable (battery or hand-crank powered)

Disadvantages:

• Requires clear water (turbidity blocks UV)
• Battery dependent (carry spares or solar charger)
• Fragile (electronic device)
• Expensive initial cost

Best practices:

• Pre-filter turbid water
• Ensure full bottle volume treated (stir throughout)
• Maintain battery charge
• Protect from impacts

Combination Approaches

Belt-and-braces method: Filter + chemical purification provides maximum safety.

Rationale:

• Filter removes sediment, improves taste, removes protozoa/bacteria
• Chemical treatment kills viruses and any bacteria that passed filter
• Combination addresses all pathogen types

Practical: In backcountry areas with low viral risk, filtration alone often adequate. In developing regions or questionable water, combine methods.

Field Water Assessment

No field test guarantees water safety, but observational assessment informs risk level.

Visual Assessment

Clear water: Better than turbid (but not guarantee of safety—pathogens invisible)

Color:

• Clear/slight blue: usually good
• Brown: sediment or organic matter (not necessarily unsafe)
• Green: algae (can produce toxins—avoid if possible)
• Red/orange: minerals (iron, manganese—generally safe but poor taste)

Surface observations:

• Foam, scum: organic matter, detergents (avoid)
• Oil sheen: petroleum contamination (DO NOT USE)
• Dead animals visible: contamination likely (move upstream or find different source)

Smell Test

No smell: Good sign

Musty/earthy: Organic matter (usually okay)

Chemical/petroleum: Contamination (avoid)

Sulfur (rotten egg): Hydrogen sulfide (non-toxic but may indicate other issues)

Sewage: Human waste contamination (absolutely avoid)

Taste Test (Only After Purification)

Never taste untreated water to assess quality. After purification, taste provides information:

Clean, neutral: Good water

Metallic: High mineral content (generally safe)

Salty: Dissolved salts (if very salty, dehydrating—avoid)

Chemical: Even after purification, avoid source

Bitter: Various possible causes—trust cautiously

Context Assessment

Upstream sources:

• Livestock access? (fecal contamination likely)
• Human activity? (various contaminants possible)
• Industry? (chemical contamination risk)
• Dead animals? (bacterial load)

Water movement:

• Fast-flowing: generally better
• Stagnant: higher contamination risk

Surroundings:

• Pristine wilderness: lower risk
• Near human habitation: higher risk
• Agricultural areas: pesticides, fertilizers, animal waste

Wildlife activity:

• Heavy use by animals: increased pathogen load
• No animal sign: possible contamination (animals avoid bad water)

Water Storage and Transport

Containers:

• Metal (stainless, titanium): can boil in, durable, heavy
• Plastic (Nalgene, water bottles): lightweight, can’t boil in, durable
• Collapsible bladders: very portable, fragile
• Improvised (plastic bags): emergency use, prone to leaks

Storage guidelines:

• Keep containers sealed (prevents contamination)
• Label treated vs untreated water (don’t cross-contaminate)
• Clean containers regularly (biofilm develops)
• Dry thoroughly when storing (prevents mold)

Carrying capacity: Minimum 2 liters per person per day for drinking. More in hot conditions or high exertion.

Hydration Strategy

Proactive drinking: Don’t wait until thirsty. Thirst indicates existing dehydration.

Urine color: Best hydration indicator. Pale yellow = adequate, dark yellow/amber = dehydrated. (Note: some vitamins darken urine regardless of hydration.)

Morning hydration: Drink before starting day. Overnight mild dehydration normal.

Activity hydration: Drink regularly during exertion—small amounts frequently, not large amounts infrequently.

Evening hydration: Ensure adequate fluids before sleep (but not excessive—nighttime bathroom trips in cold/dark unpleasant).

Cold weather: Dehydration easy to overlook in cold (less sweating, less thirst sensation). Monitor intentionally.

Altitude: Increased respiration and urination at elevation increase water needs.

Emergency Water Considerations

Survival Priorities vs. Long-term Health

In genuine survival scenarios where death from dehydration is imminent, risk calculation changes:

Drinking unpurified water: If choice is “drink contaminated water now and possibly get sick in 3-5 days” vs “die from dehydration in 24 hours,” drink the water. Giardia is miserable but rarely fatal; dehydration kills.

Questionable sources: Springs are safer than streams, streams safer than ponds, clear flowing water safer than stagnant turbid water. Choose best available option.

Minimal purification: If unable to properly purify (no fire, no tablets, no time), at minimum allow water to settle (sediment contains many pathogens), use cloth filtration, and choose cleanest source available.

Dangerous Water Myths

Myth: Running water is safe Reality: Upstream contamination affects downstream water regardless of movement.

Myth: Clear water is safe Reality: Pathogens are microscopic and invisible. Crystal-clear mountain streams can harbor Giardia.

Myth: Animals drinking there means it’s safe Reality: Animals have different immune systems and parasite tolerances. Wildlife drinks from sources that would sicken humans.

Myth: Freezing kills pathogens Reality: Many pathogens survive freezing. Frozen water is not purified water.

Waterborne Illness

Understanding what you’re protecting against provides motivation for proper purification.

Giardia lamblia (Beaver Fever):

• Symptoms: Severe diarrhea, cramping, nausea (onset 1-3 weeks)
• Duration: Weeks to months if untreated
• Transmission: Fecal contamination of water
• Prevention: Filtration (0.2 micron), boiling, chlorine dioxide

Cryptosporidium:

• Symptoms: Similar to Giardia, severe in immunocompromised
• Duration: Weeks
• Transmission: Fecal contamination
• Prevention: Boiling, extended chlorine dioxide (4 hours), NOT reliably killed by iodine

Bacteria (E. coli, Campylobacter, Salmonella):

• Symptoms: Diarrhea, fever, cramping (onset 1-3 days)
• Duration: Days to week
• Transmission: Fecal contamination
• Prevention: All purification methods effective

Viruses (Norovirus, Hepatitis A):

• Symptoms: Variable depending on virus
• Duration: Days to weeks
• Transmission: Fecal contamination
• Prevention: Boiling, chemical treatment, NOT removed by filtration

Treatment: Medical attention for severe symptoms (bloody stool, high fever, signs of dehydration). Rehydration critical for all waterborne illness.

Conclusion: Water Competence

Water is simultaneously essential and potentially dangerous. Competent water management requires:

Knowledge: Understanding where to find water, how to assess it, and how to make it safe.

Preparation: Carrying appropriate purification capability (tablets, filter, ability to boil).

Discipline: Actually purifying water even when thirsty, when it looks clean, when you’re tired. Most waterborne illness results from “just this once” decisions.

Assessment: Balancing long-term health concerns with immediate survival needs in genuine emergencies.

Master water procurement and purification. Practice with your equipment before depending on it. Understand the limitations of each method. Stay hydrated, stay healthy, stay capable.

Clean water is not luxury—it’s foundation of all other activities. Dehydration impairs every aspect of performance. Waterborne illness can incapacitate you for weeks. Get water right, and everything else becomes possible.