Some people take consolation in the fact that they have developed "wilderness skills"--they can build a shelter from pine boughs, or start a fire with a bow drill after the matches run out, or catch fish with a safety pin and wood grubs. This is all well and good, but it's not going to save your life. If you're stuck in the wind and freezing rain, your pine-bough shelter is going to leak like a sieve. If you can find dry, hard wood, you can make a fire pretty quickly with a bow drill, but if the only wood at hand is wet and punky, it will take hours…if you can do it at all. If you can catch fish with a safety pin or snare rabbits, it will help a little, but not enough. You need a minimum of 2,500 calories a day if you are active in the outdoors, and you won't get anywhere near this on dace and sculpins and the occasional rabbit.