Field Water & Sanitation — Finding It, Making It Safe, and Not Making Yourself Sick

You can go weeks without food. You get about three days without water, and far less in heat.

But dying of thirst is not what happens to people. What happens is diarrhea — and it is almost never the water source that caused it. It is hands. Waterborne and hand-borne illness is the single most common thing that goes wrong on a trip, in a disaster, and in every emergency camp in history, and it is very nearly all preventable.

This book covers both halves, because they are one problem. How to read terrain to find water, how to get it from dry country and cold country, and then how to actually make it safe — settling, clarifying, boiling, filtering, chemical treatment, UV, solar disinfection, distillation, and how to choose between them. Then sanitation: handwashing, latrines, camp layout, food and dish handling, and what to do when somebody gets sick anyway.

It is specific about the things most guides get wrong. Most portable filters do not remove viruses. Iodine and chlorine do not kill Cryptosporidium. The improvised sand-and-charcoal filter every survival book shows you makes water clear, not safe. Cold water and cloudy water both make chemical treatment take far longer. These are the gaps that make people ill while they believe they are being careful.

Adapted from public-domain United States military field hygiene instruction and federal public health guidance, rewritten in plain English.

What's inside

• 45 pages, 21 chapters, 5 appendices, 15 diagrams
• How much water you actually need, and why cold weather hides the need
• What makes water unsafe: bacteria, viruses, protozoa, chemicals, salt
• Reading terrain, vegetation, and animal sign to find water
• Water in dry country: digging, transpiration bags, solar stills — with honest yields
• Snow, ice, sea ice, and coastal sources
• The treatment chain, and the one step that actually makes water safe
• Boiling, filters, purifiers, iodine, chlorine, chlorine dioxide, UV, SODIS, distillation
• A full comparison table of what each method handles and misses
• Storing and carrying water, plus the water already in your house
• Handwashing, the tippy-tap, and why sanitation beats treatment
• Cat holes, straddle trenches, latrine siting, camp layout
• Waterborne illness, oral rehydration, and when to get help
• Boil-water advisories, floods, wells, and household emergencies
• Quick-reference treatment table, kit checklist, and a field card

Who it's for Hikers, campers, paddlers, hunters, travelers, and anyone building a household plan for the week the tap runs brown.

Note on scope This is field guidance, not medical advice, and it covers biological contamination. Chemical and radiological contamination are explicitly out of scope, and the book says so rather than pretending otherwise. During any official advisory, follow your health authority.

Format Instant PDF download. Letter size, prints cleanly at home, reads on any device. Yours forever, no subscription.