most everything needs water to survive, so I would look for water first. If you can't find water, make a place for water to gather. I once seen a show where a guy dug a ditch in a desert, laid a tarp in the ditch, poked a hole in the middle of the tarp, and put a can under the hole. After morning, the dew gathered and ran down the tarp into the can. It was enough to get a good drink from. Granted you need these supplies, but I bet you could compensate.