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Wanabe:
If you are close to shore you go to first pub and order water (or beer). Problem solved.
If you are far away from shore the air pollution is lower than in any urban area. You just have to let go the first shower to clean the air a little (it also washes the sails and the deck), then you are better off drinking rain then not to drink at all.
There are millions of people in the world drinking rain water. (Some get sick).
If you are on a boat you can boil that water to make it safe.
If you run out of gas you can make solar cooker from Alu foil and some other stuff you find on a boat (lots about solar cooking is available on the web, so get educated as part of good seamanship, you never know when you run out of gas.)
If you are in a raft your chances are limited. But better to drink rain water than sea water, Sea water will kill you in no time.
(if you had a survival hand operated water-maker you would not start this tread)
Coffee filter is a joke. Large particles of dirt are most likely not your worst enemy. Boiling water is the right way to go or proper filtering - some boaters equip their boats with good filters anyway to filter questionable water you get in marinas/gas stations. Chemical treatment is good too.
I have a portable carbon filter advertised to do the job - but I would prefer not to rely strictly on it - would boil as well.
Where I leave we have some rural areas where houses collect rainwater from the roofs and not long ago they used it for drinking. And most survived.
Now the only use it for watering the garden or wash the car and for washing machines (excellent as it contains no limestone). Even when I was a kid we drank it in some cottages in the mountains.
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