We already use mostly generic stuff, though this week I am heading out with a couple months worth of coupons to see how I can do. Since it's usually just the girls and I, we do a lot of processed foods. DD2 won't eat most fruits or veggies so I usually try to have some fresh fruits and/or veggies around for DD1. DD2 eats a lot of chicken nuggets, chicken breast, pork chops, hot dogs, baked potatoes and Ritz or saltine crackers. I tend to eat whatever I can find and prepare quickly. The exception is crockpot stuff. If we do that, DD1 and I will usually eat that and I will find leftovers for DD2. I would love to venture way from meat more and would love to just make 1 meal that all of us can eat.
My daughter is also allergic to dairy and I've found that just about every processed food has dairy of some form in it. It's also not as economical to use processed food.
I never make two meals for my family. My daughter is a great eater but my son doesn't seem to eat nearly as well. I just figure he is growing fine and he will eat when he is hungry. I suggest making one meal and then not letting your daughter snack on junk. This way she will eat what your serving and may actually find some healthy foods she enjoys.
That being said, I try to do every other dinner vegetarian. Basically for the cost savings as well as the health benefits. We have 12 backyard chickens, so we eat a lot of eggs. I also will buy a pound of dried beans (black, pinto, black eyed peas, navy) and use these for meals. I simply soak the whole pound of beans in water overnight (to reduce gas) then cook on high in my 6 quart slow cooker for about 8 - 10 hours. I freeze them in quart jars so that I can take out a single serving and use for a meal.
So with my beans, I will make 3 bean chili (just use your normal chili recipe and replace with several types of beans), bean burgers (I use mashed rice, mashed black beans and breadcrumbs mixed with sauteed and diced onions, peppers, and spices), soups, bean and egg quesidillas (just take two whole wheat flour tortillas and fill them with shredded cheese, beans and scrambled eggs), bean quiches (even my husband will eat these, real men DO eat quiche! You can use a frozen crust or an easy recipe is 1 1/2 cups of flour, 2T sugar, 2T milk - I use almond, 1 t salt, 1/2 veg or canola oil, mix together right in the pie dish and press into place, fill with 5 eggs beaten, leftover veggies, I have used everything from acorn squash to asparagus, beans and cheese, I use soy or goat) and I could go on and on about what I do with my beans! Love them!
We also do simple curries for vegetarian meals, I whip up my favorite curry recipe and use a diced eggplant and some diced sweet potatoes over rice. It's carb heavy, but it's very yummy and full of vitamins and fiber.
I could go on and on. I love to cook!