The next question you'll be asking is, is it wheat or gluten?
If its gluten, you'll need to watch things like oatmeal, which you can buy gf. You'll also need to avoid things like white vinegar.
And, if it's gluten and you're ready to add dairy back, you need to find gf dairy products, which I learned from a friend who has a daughter with celiac. The next time we retry dairy, it'll be with gf dairy, which, like everything else gf, will probably be more expensive. I'll address the expense soon as well. We're not destitute, but free my husband drives 80 miles a day in his f-150, the amount of cash left to play with after bills is not as much as I'd like!