It is possible to draw moisture from the ground and plant material. This moisture, which is water, obviously would be essential to your survival. One can do so via stills(water). You can use these in various parts of the world. Certain materials you will need to build so.
Our bodies are composed of around 60 percent water. It cannot be said enough how vital and necessary it is for us to live. Take this into reference: dehydration can kill a person in just 3 days while death from hunger can kill in upwards of 35.