Vast majority of that water is for Agriculture. We may want to re-think our diets a bit. Why are you growing Avocados and Almonds in a Desert? Just an example.
Israelis are experts at farming in a Desert, how do they do it?
Full disclosure; I live in Hawaii and grow stuff year round,
but it is warm and wet here, and a lot more expensive to farm than a Desert.
Our biggest farming problem is Democrat NIMBYs.
Why are you growing Avocados and Almonds in a Desert?
The alternative is importing them, which raises our trade deficit.
The solution is fewer new immigrants.