I like the vinegar idea to clean fruit and veggies.
I'm not much of a cook, but since getting the van, I've been experimenting with different foods I didn't even know existed before: especially canned white chicken meat, which is very good as it turns out, and boxed dried potatoes, hashbrowns not mashed. The latter take some cooking, but I pour boiling water over them and let them soak for a while before frying.
https://www.target.com/p/hungry-jack-premium-hashbrown-potatoes-4-2oz/-/A-14773138
I cook (fry) everything in olive oil. The canned chicken meat, plus small 40-cent can of green beans or corn, plus some dried hashbrowns, makes a full meal for a bad cook. Plus usually some cut up fresh tomatoes and red/green peppers, kept in the cooler. Mornings are usually bananas, instant oatmeal and coffee using the Bodum coffee press.
Everything canned anymore has a lot of salt, unfortunately, so my doctor is looking cross-eyed at me. I also like a certain brand of chili in a can, and just recently developed a total rice cake addiction (after watching RVCarolyn eating them in Alaska). So, pretty much a lot of non-refrigerated (albeit high-salt) foods. Stagg is great tasting, but Nalley is bland.
https://images.samsclubresources.com/is/image/samsclub/0007110602883_A
In general, I look for food I can simply add boiling water to, or fry up in a few minutes to save on propane.