the answer IMO is desalination but that would requires large amounts of energy. Of course they can harness their wind and solar ...
De-Sal can supply the cities, at a reasonable cost.
However, agriculture is toast, especially the annual crops.
Possibly tree bearing crops will have to go also.
In the meantime they are building a railroad, no one wants.
Absolutely, if Israel could become water rich then California with all of it's resources should be able to do the same. However moonbeam would rather worship gaia, blame globull warming and build a bullshit train to nowhere for his legacy of stupidity this term.