peanut butter, keep some potatoes/sweet potatoes baked and ready to eat in the fridge, milk, protein shakes, you can pre-cook eggs theyll keep for a few days, lunch meat, tuna.
really with a little bit of prep you can take 5 minutes and make sure you have eaten breakfast and a portable lunch put together. I work in a house so I bring staples and keep them stocked here, cheese, tuna, lunch meat, veggies, usually some kind of whole grain carb for when I'm really running around, pb, etc. then even if I forget I always have something. I am pretty good at bringing stuff on my monday's having packed my sunday night… once you set a routine just stick to it and let it work for ya