The Desert Tortoise will dig catch basins in the soil to catch the infrequent rain that falls. They remember where the basins are and return to them when it rains. Most of their water intake comes from moisture found in the grasses and wildflowers they eat in the spring. The tortoise has the ability to store about a quart of water in its bladder to be used when necessary. Adult Desert Tortoises can go for years without water.