Water guzzling agriculture is neither science nor technological feat as it is often marketed.
Key concept is to maintain the topmost layer of the soil well-nourished, well-moisturized. And we do not need gallons of tube-well water for it. Not even drip irrigation!
Not so long ago, winter crops in India were grown without any water!!
1) Water along with dung-based manure (full of Marut(s) i.e. bacteria) keeps soil in optimum state with very less water.
2) Cow-dung ash spray reduces vaporization by the Sun upto 40%
3) Inter-cropping or layered-cropping does not allow much of the sunlight penetrated directly on the soil but instead maximum is utilized by the multiple green layers.