Quote Originally Posted by Great-Kazoo View Post
Buy a bag or 2 of all natural charcoal, along with a bag or 2 of beach (fine) sand . You can make your own reverse osmosis system, with the sand and charcoal, after crushing it. Fairly labor involved.
That would be an activated charcoal filter. Reverse osmosis uses a membrane that has holes small enough for water molecules but only just and requires pressure to opereate and a drain line

Also note things like micron ratings and absolute rating are two different things.

To answer the title question 110 gallons lasts 2 weeks for 1 person. A bit more when it's hot out or I'm doing dirty work requiring more frequent showers.