Or get a family member to cook up a batch of something and freeze it. Use containers that can go from freezer to microwave. Get a microwave oven to reheat frozen foods. Keep hearty canned soups with beans, meat, and vegetables on hand. Cans of mushroom and tomato soups are good to throw in a big pot with frozen vegetables and seasoning to make hearty casseroles and stews.
Minute rice is easy to make in the microwave - add equal parts of rice and water and heat.
Low-cal cheese, cream cheese, yogurt, cottage cheese, butter and sour cream are all good substitutes for the fatty originals. Be sure to take your extra food home when you go out to a restaurant so you can freeze it and get an extra of meal out of it. I buy two pizzas, and freeze them for extra meals. I freeze two slices in each zip lock bag. The slices can easily be heated in a microwave or conventional oven.