Anyone ever make a filter from a clay pot? There are a ton of youtube videos showing terracotta (non-glazed clay flower pots) being used as filters. The clay is just porous enough to allow water to slowly drip through while the silver embedded in the clay kills the bacteria.
Myself i prefer the products from Katadyn. Katadyn
Guess they will having similar products to the Berkley filters - may check it out: http://www.katadyn.no/
In my area there still are remains of old homesteads sitting by a water source . Those sources are a dismal example of good water . Likely called springs by the now deceased inhabitants is what I call seeps . Then go look at the old cemetery's in the area began in the old homesteads era . Children make up an un-proportional amount of the graves . The reason " drinking un-healthy water from the seeps " . The point being " get yourself a large and decent water filter " . When the electricity is gone and water flowing from a pipe is not an option people will be looking at natural resources .