The energy is measure in calories. A person in good health spends easily 4,000 calories per day. So 1 kilo of food MUST supply 400 calories per 100 grams of food in order to make up for the lost. They give energy which if not used right away will be transformed in fat which is not a problem for the men in the wild since fat is beautiful even Vital . Spices are not included since their food value is low but they have their value as to the taste buds and the moral.
Dry food sold in store is excellent, light, nourishing but costly.
Powder milk, oil, enriched cereal and poly-vitamins capsules. As well as fat, Pemmican and Pinhole, Gorp, Rockomini. Fat which in calories is the most concentrated food is the sustenance most difficult to come by when living off the land. Same applies to eagles or hawks that will let their fresh prey to you in exchange for their freedom. This should not be too difficult where there are small trees to climb.