I spend the time and make up a series of read-to-cook meals in zip-lock bags. Here are some examples:
Hearty porridge: rolled oats, milk powder, dried fruit pieces; various nuts, brown sugar, cinnamon powder. Add water and heat and you've got a solid breakfast. Can vary amounts and types of nuts to maximise high-energy oil content.
Spicy coconut curry: red lentils, powdered coconut powder, veggie stock powder, spice mix (grind my own), dried mushrooms, dried onions, garlic powder, sundried tomatoes. Add all this to water and cook until lentils are soft. Serve with rice using absorption method cooked beforehand.
Beef stew: beef stock cube, dried onions, garlic powder, dried beef (I make my own jerky), soup mix grains (mixture of lentils, beans, barley etc).
Foods like this plus generous bag of dried fruit and nuts keep me going for weeks.