Safe foods

Grains
Rice
Teff?  (Hasn't tried it again in a long while)
Buckwheat? (Hasn't tried it again in a long while)

Fruit
Apples
Pears
Peaches
Grapes
Coconut

Cherries?

Vegetables
none

Dairy Alternatives
Coconut (coconut oil for "butter" and Natural Value brand canned milk because it's guar gum-free)
Rice (WestSoy Plain Rice Beverage is the only corn-free, sunflower-free rice milk I've found locally)

Baking Ingredients
Arrowroot
Tapioca?
Yeast

Additional
Chocolate (cocoa powder & Enjoy Life! chips & Boom Choco Boom bars)
Kosher salt (table salt contains corn)
Cinnamon