A Zeer pot is an evaporative cooler. In dry 90 degree weather you can see cooler temperatures in the 40's. Basically it's two clay pots separated by a layer of water infused sand, and a wet towel over the top. If the inside of the interior pot is glazed (water proof), seawater or other non-potable water can be used instead of fresh water. It doesn't get much simpler than that.
A tomato that lasts 2 days on the counter can last 20 days in a Zeer pot.
Learn how to build one at http://www.green-trust.org/wordpress/2011/08/15/non-electric-cooling-for-hot-dry-environments-zeer-pots/
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