/ first_moves
Do these first
/ failure_mode
How this plan fails
Water contaminated by fuel, toxic chemicals, or radioactive material may not be made safe by boiling, disinfecting, or ordinary portable filters.
/ avoid
Do not spend your first mistake here
- Assuming a camping filter removes viruses, chemicals, fuel, or every parasite.
- Treating floodwater or chemically contaminated water as normal backcountry water.
Water treatment starts before the filter. Choose the cleanest available source. Avoid water with fuel, chemical smell, industrial runoff, flood contamination, or visible hazards when any safer source exists.
If water is cloudy, settle it and prefilter it. Boiling is the most reliable household method for germs when fuel and safe heat are available. Filters can help, but they have limits. Some remove parasites and bacteria better than viruses; none should be treated as a chemical-contamination solution unless the manufacturer and local guidance support that use.
Keep clean and dirty containers separate. A perfect treatment step can be ruined by pouring safe water into a contaminated bottle.
The field rule is simple: source carefully, treat in layers, and do not pretend chemicals are germs.