Most likely, in any survival scenario, the most viable resource for calories and nutrition comes from small game and fish (if you are left without prepared sources). Trapping, snaring, and fishing techniques, when employed properly, can maximize your ability to collect food resources with the least expenditure of energy. Knowing even simple snaring, trapping, and fishing techniques could enable you to get through an ordeal where your energy and focus is required to be as high as possible. Don't rely solely on what you've brought with you. Know how to set a few snares, traps and lines and truly maximize your potential to get through whatever situation you find yourself in.