You need Solar powered atmospheric water generators, which can be mass produced and sold like Cars or Phones
you could run these off oil and gas turbine engines, u just need the condensors, im sure oil refinery equipment could be converted into condensers
How much is all the equipment worth to produce clean, healthy and crystalline water?
With 100,000 € you can produce 32,000 liter of water per day.
if you have water, if you want to produce it from the athmosphere, I don't know the price.
https://www.solylend.com/fr/projets/2-aqualink-l-eau-potable-pour-tous https://www.waterfromair.co.za/