on the west coast of Mexico they mix their water with Sea water For Showering, Washing etc, and there are Mom & Pop Reverse Osmosis Water creators all over the place, they sell 5 Gal of Purified water for $1 Delivered,
They actually drive around in Trucks saying AGUA, AGUA over the loud Speaker, you flag them down and the guy brings in a 5 gal Jug of Water for $1 and takes your empty bottle.