Are you looking for a way to purify your own drinking water in an off-grid or long term boondocking situation? LDSPrepper reviews several popular filtering systems. Notably, most filtration systems require you start with pre-filtered tap water, so they’re near useless in a boondocking situation when all you have available is river or pond water. His summary includes a clear winner.
(Note: Since he is reviewing only expensive commercial filters, he does not include an inexpensive DIY bio-sand filter.)
Did you know that for about $30, you can make a great water filter that can remove up to 99% of contaminants? All you really need are a few 5-gallon buckets, some plastic pipe and fitments, and 3 grades of filtering media: fine sand, regular sand, and gravel.
This 3 part video will show you exactly how to construct not only the bio-sand filter, but upgrade it to incorporate a carbon filter to remove some of the few common contaminants that bio-sand filters miss.