I'm learning to cook for 1 and a half -- yes there's such a thing! My daughter is home with me some of the time and sometimes with her fiance. I've found that a meal for 4 people (as I used to cook) will be four meals. Items such as chili, tacos, spaghetti, baked chicken among other things can be made ahead and stored as single meals in the freezer. I also pack large amounts of meats in small containers in the freezer to cut down on waste.
Then, a habit I need to start, is pre-cooking for the week on the weekend. This may not mean "feeding the freezer". Sometimes making a family dinner easier if the meatloaf is already mixed in the pan and ready to go in the oven. Are the potatoes cut up and in the kettle ready to boil? Any little tasks can make a big difference. Hard-boil eggs, mix tuna or chicken salad, cut up veggies (lunches or dinners); just be observant of any time you can "batch" a meal task (cut up all the veggies, peel and slice potatoes, fry that large package of hamburger and divide into smaller portions, bake 2 chickens) the sky's the limit.