Faisal, thanks for the information on gallons of water per square foot. Until now, I had no idea what the ratio should be. That gives me a much better understanding of what sized water barrels I'll need to use.
Stone are also a good idea, and I have lots of them, but I'm not sure that they could absorb enough heat through the plastic to keep the inside warm at night. It gets very cold here in the winter. It's a great suggestion though
