water
Boil water
When you have fire and a pot
- Bring water to a rolling boil for 1 minute.
- Let it cool covered before drinking or storing.
At elevations above 6,500 ft, boil for 3 minutes.
Reviewed 2026-11-05 · 1 source
FieldryGet the appWhen thesignal drops.
A calm, offline field guide for water, fire, shelter, navigation, and disasters. No login. No ads. No subscription.
5 cards ready offline
Six domains. One field guide.
The card is the unit. Pick the thing in front of you, not a chapter. Every card is short, sourced, and written to be read under stress.
Water
Find it. Make it safe. Store it.
15 cards in this domain
- Boil water
- Chemical contamination
- Chemical disinfection
- Filter cloudy water
Read it in the dark.
No endless article. The card gives you the next action, the reason, and the warning in the same glance. Then it gets out of the way.
The web guide is the long version. The app is the field version: the same card, offline, with search and sources.
Boil water
When you have fire and a pot
1
Bring water to a rolling boil for 1 minute.
Heat kills bacteria, viruses, and parasites.
At elevations above 6,500 ft, boil for 3 minutes.
2
Let it cool covered before drinking or storing.
Avoid recontamination and burns.
Reviewed 2026-11-05 · 1 source
Three moves.
Search for the thing in front of you, not a chapter. Water. Fire. Shelter. Bleeding. Lost.
Each card is a short sequence with the reason and the warning beside the action.
Every safety card names its publisher and review date, so you can see where it came from.
Find water
Look low, look green, avoid contamination
- Look for moving water, rain catchments, or green vegetation in low ground.
- Avoid floodwater, water with a chemical sheen, or water near fuel spills.
Sources: ready-water, cdc-water-treatment
Where the signal ends.
One price. No rent.
$8.99
one time
The whole field library, tools, family profiles, printable plans, and content updates.
- All 98 field cards
- Search, tools, and checklists
- Family profile and printable plans
No ads. No subscription. No login.
Before you need it.
Does it work without a signal?
Yes. The field cards, search index, tools, and sources are bundled with the app. Dynamic weather and hazard data are optional and only refresh when you have a connection.
Does Fieldry give medical advice?
No. Fieldry does not provide first-aid, medical, or dosing instructions. Call your local emergency number and follow professional guidance.
Do I need an account?
No. There is no login, no tracking, and no cloud account in v1. Family profiles and checklists stay on your device.
What stays free?
The basics: water, fire, shelter, calling for help, and the 72-hour kit checklist. The paid tier is for depth, tools, and the full library — not for hiding the life-saving basics.
Is it a subscription?
No. Pro is a one-time purchase. There are no ads and no recurring charge. If we add live services later, they will be optional and separate.
Where do the sources come from?
Official guidance from FEMA, CDC, EPA, NWS, USGS, USDA, USFA, the Red Cross, and the American Heart Association. Every card shows the source and review date.
Start with water.
Download the field guide, open the water card, and read it before the power goes out.
Fieldry for iOS
Water, fire, shelter, navigation, and the way out.
One-time purchase. 98 cards. 36 sources. Works offline.
See the app