I found the camping section at Walmart has a small ice pack you can freeze every day. I think they are only about a dollar each. You can make 'wraps' tortilla with a sauce and meat wrapped like a pinwheel. Soup is also a good winter meal. Put it hot in a thermos and it should still be warm when he eats it. Stew also can go that same way. Cheese sticks, or cubes are good. A salad with a small (separate)container of salad dressing on the side, works well, you can add meat on top. Meat loaf sandwiches are great, add a little catsup. He'll tell you which are the hits and which are the misses. My husband likes potato chips on top of his sandwiches, but that's not very healthy is it?