While I'm a big proponent of carrying a map of your hunting grounds with you, its important to study it before you trip. The main nutritional reason is to know your proximity to water sources. Are there several streams nearby? Will you be near a lake? Is there only one water source? If you get lost, injured, or otherwise need extra time you need to know how close you are to water. On that note, while hunting solo I always carry iodine tablets with me. They're the lightest, smallest way to make water drinkable. All you need is a nalgene bottle or bladder reservior.

As far as food, I stick to trial mix. You're walking on trails so that's the law. Just kidding. Trail mix is easy to carry, non greasy, doesn't smell, and wont make your breath smell. its also loaded with fat and calories so you'll get more energy from it than from a comprable weight in apple slices. I concur with the beef jerkey fans, but don't carry it myself. Good luck and God bless.