We have the same problems in Texas: Prolonged severe to moderate drought; lowering levels in lakes and reservoirs; and lowering levels in aquifers.
Not counting for water which may be produced by desalination, water is a zero sum game. All water is spoken for and water for public consumption is given priority over agricultural uses.
The Kay Bailey Hutchinson Reverse Osmosis desalination plant in El Paso, Texas is the largest inland reverse osmosis desalination plant in the world. Texas is also building reverse osmosis desalination plants in Brownsville, Corpus Christi, Port Lavaca, and Freeport.
Of course, people fleeing other states like California seeking employment in Texas place additional demands on our water supply.
I believe that Texas will be OK. We'll just build more desalination plants.
We must provide water for agriculture. We must be able to eat as well as drink.

Let the people starve to save a fish.

just piling it on them:
http://naturalresources.house.gov/issues...

Looks like it's time to restart the argument to pipe water from the Columbia River again.