Real oatmeal and/or steel cut oats w/ raisins and pecans powdered milk and/or powdered protein mix of some sort for breakfast. This stuff sticks to your ribs. Premixed daily portions using small sized ziplock bags.

I make my own Logan bread for snacking on.

PBJ wraps till I run out of wraps.

For a trip that long dried beans or lentils might work. Freeze dried split pea soup or bean flakes from the bulk section is another idea.