How about a slipstick of engineers?

The problem with desalinization is the byproduct salts. Although the oceans have been getting fresher due to ice melting, the byproducts of Reverse Osmosis are concentrated salts which are toxic to water-borne life in the immediate area of the discharge. For an extreme example, note that the Persian Gulf is now a dead sea due to the amount of discharge from the states around it all using desal.

While RO is the cheapest approach in terms of cost per gallon, it is not the cheapest in terms of long term effects. Besides RO water tastes dead and has to be remineralized in order to be safe to drink. Drawing on Fossil Aquifers is not viable as these aquifers recharge either very slowly or not at all.

We are headed for a future in which open field agriculture will largely become a thing of the past, as most of the water currently used for agriculture evaporates and is wasted. I am an advocate for Atmospheric Water Generation as a long term solution.

Given AWG, it is possible to draw most of the water from the air, either in the greenhouse or from the ambient air or a combination of both. Greenhouse agriculture can be controlled in ways that open field cannot and can have an extended growing season. It is an approach which minimizes impact on groundwater and which does not demand as much in terms of disposal.