The key to life is to have natural free water in abundance! Filtering or processed water is no substitute and no solution to the global water problem. Water needs to be reestablished in its original quality. Free from any pollution no matter the cost in financial or economical loss. Life is infinitely more valuable than any profits by industrialization!
Originally and until some 50-70 years ago, most rivers, creeks and ground water sources where of drinking quality of near drinking quality without any processing.
As a result all vegetables and other food needing water were healthy and clean all the way. In modern times all soil, all groundwater and all well water either is polluted or death. Resulting in polluted food growing out of polluted water or sick, weak vegetation needing all kinds of chemicals in an attempt to keep vegetation alive.