We spend $800-$1200/month on groceries/Walmart supplies. So that includes toilet paper, dog & cat food, trash bags, etc. We are a family of 5. Me and DH. Kids are 18, 16 and 12. My oldest is a vegetarian, so I usually have to buy him frozen dinners/veggie burgers so he has something to eat for dinner. I refuse to plan 2 meals so I try to make sure he has something around that he can make for himself if the main dish is something he can't eat. If it's something where I can just leave out the meat for him -- pizza, tacos, spaghetti -- I do. But not everything is like that. My 16 y.o. dd also eats healthy. She probably costs me $100 in greek yogurt, pounds of bananas, organic cereal, fresh veggies, etc. that I probably wouldn't buy if not for her. Yes, I repeat meals. When I plan a week's worth of meals, I try to have a pasta night, a Mexican night, a sandwich/salad night, a chicken night. Pasta might be spaghetti one week and ravioli the next, but it's still pasta. Mexican might be tacos one week and enchiladas the next, etc.
I would love to cut down on our food budget, but I'm already planning before I step in the store, buying store brands, etc. We just have 5 adults eating and it's not cheap at all. Oh, and we very rarely go out to eat so that drives up our grocery budget. If we go out for a meal, it's almost always Subway and we just get subs and bring them home.