There is a water shortage and you propose to solve it with two solutions that don't currently exist. Not everyone harvests rain water right now. The solar that

There is a water shortage and you propose to solve it with two solutions that don't currently exist. Not everyone harvests rain water right now. The solar that you speak of doesn't exist, and filtering sea water is definitely not as simple as "using some of that solar power". It is a problem because the situation currently is looking pretty bad. As far as I can tell people are not denying that a solution is possible. When is it not?