This discussion is missing Fireball.
A shot of fireball cinamon flavoured whiskey before bed would make the even coldest nights toasty warm. Never do a trip without at least a couple of shots ready and in my pack.
I usually like plain oatmeal with some cinnamon sprinkled in, whey powder and a large glob of peanut butter for breakfast. Bagel with PB+J for lunch, and then whatever I feel like lugging in for dinner.
Snacks will be gorp, apple with PB, cheese, pepperoni sticks, that sort of thing. Sometimes just a couple spoonfuls of PB is a great snack too (it's super calorie dense)