I have a gluten free and dairy free dcb. I just give him what we eat, but substitute gluten free grain products. Yes, I buy premade gluten/dairy free bread, boxed pancake mix, frozen waffles, Chex cereal, gluten free noodles, gluten free pretzels, rice cakes/crackers etc... We have a section at our store that has gluten free and or dairy free items. They even have gluten free and dairy free mac and cheese (frozen)!
For lunches I give him what we have, but if the meal I'm making has milk in it, I either make a substitute of what we have, for instance, if I make AugGratin potatoes, I just make him a baked potato or sweet potato. If it's something like spaghetti, I just make his noodles separate and add the meat and sauce later. If the dish has cheese for the protein, I will make something with beans or lentils instead. A lot of lunch meat is labeled as gf.
So today here is what dcb ate:
B- Gluten free oatmeal, banana, almond milk (my fp sponsor allows it)
AM Snack: Rice Crackers, Almond milk
Lunch: Tuna noodle salad (I made some of his noodles), peas, and Almond Milk
PM Snack will be: Gf pretzels (we are having soft pretzels) strawberries
I just realized that you are Gf, so you probably already know that part.
Hope this helps a little!