Not sure if you YANKS eat Barley, but here in Down Under, we make a stew from any cheap meat you like, beef, pork or chicken, sometimes lamb if you can get a cheap shoulder, and put 1-2 cups of Barley in depending on stew size of course. You can freeze individual portions or the whole thing and heat it up in camp while you hunt, the smell upon your return will be delicious.
It makes for a wholesome and delicious meal that keeps your energy up with very little actually eaten.
The other thing I use a lot of is oats, either as porridge or as homemade muesli bars or slice.
I also take small tins of flavoured tuna with crackers to have for lunch. It is cheap and very nutritious.
Cheers.
