If we find dense reeds in the desert, it means that we can dig water more than one meter underground; if we see Achnatherum splendens, we can dig water about two meters underground; if we see red willow and camel thorn, we can dig 6-8 meters underground; if we find Populus euphratica, we can dig 8-10 meters underground.
In addition, if you find wet sand or bitter water in the desert, you can also dig a pit and cover the pit with transparent plastic cloth, thus making a simple solar distiller. The air and soil in the pit heats up rapidly, generating steam. When the water vapor reaches saturation, it will condense into water drops on the inner surface of the plastic cloth and drop into the container below, so that we can get valuable water. In this way, more than one liter of distilled fresh water can be taken every day. It is worth mentioning that most of the groundwater in the desert is very salty and alkaline, so people can't drink it directly (camels can drink it), so they must use distillation and other methods to deal with it.