Discipline 01
Water & Purification
Collect, clarify, filter and disinfect water 15+ ways.
Field-Tested
Disinfecting Water by Boiling
The most reliable way to kill disease-causing organisms without chemicals or filters.
Beginner · 15 min · 5 steps
Field-TestedDisinfecting Water with Household Bleach
Measured, unscented bleach can disinfect clear water when boiling isn't possible.
Beginner · 35 min · 5 steps
Field-TestedSODIS: Solar Water Disinfection
WHO-recognized: clear PET bottles in direct sun use UV and heat to reduce pathogens. Water must be clear first.
Beginner · 6–48 hours · 5 steps
ConditionalThe Solar Still
Famous, but very low yield. It can cost more sweat to dig than it produces.
Intermediate · 1 hour + 24 hours · 5 steps