Israel will probably be OK. In the recent years, It invested heavily in reclaimed water and desalination facilities.
It can already provide more then 50% of it's water from desalination and dirty water processing.
The countries around Israel though, are not in such a great shape.
Jordan buys water from Israel today, and would probably need to buy more in the future.
Saudi Arabia might have some issues as well. Syria and Iraq are losing their infrastructures fast.
It doesn't help that you have water on the other side of the country, if you don't have the infrastructure to move it... or the political stability to do that.
Israel will probably be OK. In the recent years, It invested heavily in reclaimed water and desalination facilities. It can already provide more then 50% of it's water from desalination and dirty water processing. The countries around Israel though, are not in such a great shape. Jordan buys water from Israel today, and would probably need to buy more in the future. Saudi Arabia might have some issues as well. Syria and Iraq are losing their infrastructures fast. It doesn't help that you have water on the other side of the country, if you don't have the infrastructure to move it... or the political stability to do that.