For breakfasts, have you thought about making bagels or breads? You would have to get yeast, which can be bought in bulk. Spread with some homemade peanut butter and jam. You can change up your mix ins to keep it interesting. Also, as far as the bulk bins go... I'm not sure what you mean by they still have plastic? You can buy or make some reusable bulk bin bags out of cloth.
Lunches might be more difficult. Again you can make bread for sammies. I love avocado sandwiches. Salads are easy, just mix up greens and beans with some fruit on the side.
Again, if you can find a way to make bulk bins accessible to you then dinners will be a million times more easy. Beans can be your best friend. Beans and grains and vegetables. You can make your own flour tortillas easily for burritos or wraps. If you can get your hands on some wheat gluten then you can make seitan for added protein.
For snacks, bulk bins again will help so you can get some trail mix or make some fruit leather.