There's lots of advice out there about what to eat on the trail.
There are a lot of constraints on what you can eat, but it ultimately comes down to finding food that YOU PERSONALLY like.
So here's food that works for me personally:
- freeze dried food — Available at most hiking stores. They're nice, but they're also pretty expensive (~60 calories per dollar).
- peanut butter sandwiches — Use tortillas instead of bread to minimize smooshing. Add honey, jelly, and/or raisins.
- hummus and pita bread — Peanuts can get pretty boring after a while. Hummus is a great alternative (lots of protein and calories), and it comes in a wider variety of flavors. You can store the hummus in a squeeze bottle, but a cheaper alternative is to store it in a ziploc bag. I find that eating out of a single bag becomes messy, so I prefer two ziploc bags, nested, with the inner bag having one of its lower corners cut. The inner bag is used like a frosting bag, and the outer bag keeps the hummus contained.
- instant noodles — Maybe strange, but I like this for breakfast. Get a lot of carbs before you start your day, and I'm tired of oatmeal.
Some possible things to explore:
- Dehydration can be used to save pack weight, assuming you'll be able to refill on water on the trail.