I never plan menus ahead of time. Rather, I plan meals around whatever leftovers there might be lurking in the fridge, plus stockpiled food. For instance, yesterday I was under the weather so I opened a can of chili, added canned beans and salsa and that was our dinner. There was a small amount of chili left, so tonight we are having chimichangas with cheese added, plus a salad of some kind. I usually buy only seasonal produce, on sale, so that limits the menu planning. Lately, we have had fresh pineapple almost every day since the store had a loss leader of fresh whole pineapples for .99 each. I bought 4!!!!! Cheaper than canned! And absolutely delicious.
I am in the process of reorganizing the stockpiles since we have had extensive remodeling of the kitchen/laundry room/pantries. Everything will be condensed into areas...canned goods in the laundry room (which has huge shelves now), paper goods (TP, Kleenex, etc.) in one pantry, dry goods (noodles/spaghetti etc., dry mixes, sugar, crackers etc.) in another. I also try to keep a quantity of frozen meals in the freezer stockpile. When I make a main dish meal, I make enough to freeze the extras for days when I don't feel like cooking from scratch.
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