That's exactly what I used to do when I was single... make a pot of soup or a big casserole, and then eat it for lunch and dinner all week. Didn't phase me at all.
My ex hated eating the same thing more than twice a week, so I started doing a menu plan so that I was cooking something new every night five nights a week, and we would do take-out once a week and go out to dinner once a week. It was a pretty good system.
Now that it's just me and the kids, I'm sort of doing the "big pot of food" thing again, only I try not to mix it up a bit on the days that I have them, and only have one "pot O' leftovers" in the fridge at a time.
I often buy whole salmon or roasts, cut them up, and freeze them. It's a lot cheaper and it's nice during the lean times to have food on hand.
I also do a lot of drying and canning, but it being Spring, all I really have left in the pantry is applesauce.
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