For years there are the atmospheric water generators which can produce up to twelve thousand liters of drinking water per day. They are modules invented in Switzerland, developed and distributed by USA and United Arab Emirates.
Taking into account that human settlements have little access to good quality water, most of which are located in semi-desert or marginal areas of large cities; In addition, bureaucratic planning and execution of urban sanitation works lasts between three and eight years; we must massify these technological solutions. For now, these modules cost approximately half a million dollars each.
Financing can be obtained by promoting instruments such as Works for Taxes where lbig companies take a percentage of their next tax payment to be used for public works.
On the other hand, intensify technological transfers with local universities, to adapt these modules to dry places and more than two thousand meters above sea level, reduce their size and increase the amount they produce per day.
There are other outlets such as desalination of sea water, or even organic mesh that filters out impurities and water. But in each case we must think that each person should take three liters of water a day, according to the World Health Organization. Meanwhile, to wash clothes or to take a bath use other means.
This is what I can comment on. I am still looking to finance a documentary video about what I have just written, because it is necessary to spread existing solutions in the world.