Well, what is it you REALLY want to make?

A true, wet pack, retort pouched Meal Ready To Eat? You can assemble these kinds of components from most grocery stores, they might taste a little better than full meals assembled by Sopako and the like, but you won't save much.

Food that you can add hot water to? That is easy, and from what you mentioned for components that sounds like what you have in mind, or maybe some kind of compressed food bar for an emergency ration. Look at the ultra light and long hiker websites- there is a LOT out there.