My granddad has Celiacs and he was living with us for awhile. I am also a vegetarian so it really was tricky to find a lot of options that would accommodate us both. It is crazy some of the stuff that has gluten in it that you would never expect! Be careful with some soups. Some people and companies use flour to thicken the soup. Also, some soy sauces and mayonnaise contain gluten.
Bob's Red Mill(http://www.bobsredmill.com/
) have a lot of alternative flours that you can replace with regular flours when you bake. When I bake my granddad cakes and cookies I use rice flour. They also have cake, cookie, breads, and brownie mixes that only require you to add some additional ingredients like milk and butter.
Whole Foods also carries gluten free food. They have pizzas, cookies, and bread that you can get. Sometimes they even have fresh goods in the bakery. http://www.glutenfree.com/home.aspx?CategoryCode=42
Is a good source to buy almost everything!
Hopefully this helps!! Good Luck with everything!!!