Boil it
At the bare minimum, a pot, a lid and a way to heat it. That's how I'd back up any filter.
Boiling is the oldest and most reliable way to kill bacteria, viruses and parasites. If you have a pot and any heat source, you can make water safe.
It won't remove chemicals, fuel or silt, so start with the clearest water you can find and strain it through a cloth first.
Plan on fuel: boiling 4 L a person a day adds up quickly. Use it as a backup to a filter, not your only plan.
Steps
- Pour through a cloth to remove grit.
- Bring to a rolling boil for 1 minute.
- Let it cool covered.
- Pour back and forth between clean containers to improve the taste.
Products to consider
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