Can't we really find water in the desert?

There is what you call an 'oasis' in the desert. Well, it's really difficult to live in the desert itself but if ever a person who happens to be traveling through its wide expanse couldn't find an oasis, then you can break the plants that thrive there because they have water inside. Those plants survive there because they have water inside them. Other people cut a part of the camel's back because it has water inside (because camels thrive in the desert as they have water in them), but of course I would feel bad for the camel -- hehe.

i think there is that is only after when it rains. I think one can live in the desert if he has adequate source of food and water and he wears clothes that are loose

There is some water in the desert, it is call irrigation! Move the water to were you need it! ^_^