Food might not top the survival essentials list, but it is equally important as you will start to lose strength if you do not eat for a long time. It is wise to keep a small container of olive oil as it is packed with a huge amount of calories and can be used for other things as well. But if you do not have any food with you, you will have to find something to eat. Fishes, small animals, plants, and berries are some options that you can look for in the wilderness.
Plants are another natural and best options that can satisfy your hunger during survival. But it is very important to identify any plant you plan to consume. Do not eat unless you are not sure about the plant as many plants can be poisonous. The best and readily available options are acorns from Oak tree, nut and inner bark from Pine tree, stalk, root and tuber from the Cattail of the grass.