I also suggest to be water independent will save a lot more. Here are some suggestions beside googling Water Harvesting.
Before Permaculture: Keyline Planning and Cultivation
Here is a man that produced a food forest in the deserts of Jordan in salty land and after 7 years of being abandonment he came back to look at it and it was thriving without irrigation.
Since 1920's it was discovered a source of very deep water planet wide that is fresh and endlessly flowing once tapped and many times under 200 ft. It is tapped into rock fissures where it travels up. Called primary water
http://primarywater.org/
good luck