I am a fan of the Mountain House FD meats-burger, diced chicken, diced beef, and the new diced ham. But I buy the big #10 tins, and I don't think that they sell smaller packages of the meats.
Another thing I do is to buy the 2-person chicken breasts & mashed potatoes when REI has a 25-30% discount. I then repackage them into 1.5 breasts (one breast is not enough, but 2 is overkill for me). So 3 of those yields 4 tasty servings. I also repackage each bag of mashed potatoes into 2 separate servings. I vacuum-seal each portion of breasts and potatoes separately, which remain shelf stable for years in my cool basement. If I want to live large, I will also do a single serving of MH's FD peas or green beans, and I might even simmer some chicken gravy mix in a sierra cup. If I add some sort of bread, like a thin bagel, I end up eating better than I do at home.
I know that the OP wants to keep things as simple as possible, but the dehydrator and vacuum sealer are my best tools for allowing me to eat well out there.