If you cook for yourself it is much easier and cheaper, and you won't need to search out a special gf-friendly store over the summer.
tortilla chips, potatoes, rice cakes, and rice fill my "bread" space.
rice pasta fills my "pasta" space.
Fresh fruits and veges.
Your vegetarian diet won't need to change, just stay away from TVP and Seitan. (Seitan is Evil! there is a t-shirt for celiackers that says that!)
Oh, and don't lick stamps or envelopes... that glue is gluten-based.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson