1. Anyone can survive for three hours without maintaining the core body temperature.
2. Anyone can survive for three days without water.
3. Anyone can survive for three weeks without food.
Of course these are debatable but the gist of it is true. What this perspective does is help you prioritize your actions. The first thing you must do is maintain core body temperature. Next, find water. Then concern yourself with food. Get obsessed with something else when you have no backup, and you may not survive.