When my son was first diagnosed with Celiac's Disease, my wife and I didn't know where to start. We wanted to keep some things in the house that he could eat right now. This list is by no means complete, but it is a good starting point.
A List of Gluten Free Items You can Eat Right Now
Southern Homestyle Tortilla Crumbs (can use these to make home made chicken nuggets)
Heinz Ketchup
Betty Crocker Potato Buds
Kinnikinnick White Sandwich Bread
Bionaturae Organic Gluten Free Spaghetti Noodles
Oscar Meyer Beef Bologna
Sun-Maid Raisins
Apples, Apples, Apples
Skippy Creamy Peanut Butter
Marshmallows
Cocoa Pebbles
Glutino Gluten Free Pretzels
Hellman's Mayonnaise
Baby Cut Carrots
Hidden Valley Ranch Dressing (Regular, NOT Light)
Dinty Moore Beef Stew
Bob's Red Mill Gluten Free All Purpose Baking Flour (now available in many grocery stores)
Xanthan Gum
I Can't Believe It's Not Butter Spray
Kraft American Cheese Slices
Ragu Home Style Traditional Pasta Sauce
Kemps Vanilla Ice Cream
Hershey's Chocolate Syrup
Starkist tuna
Miracle Whip
French's Mustard
Amy's GF Frozen Enchilada dinners
Hormel Chile
Velveeta
Old Home or Daisy Sour Cream
Yoplait Yogurt - most flavors
Mission tortilla chips
Amy's brand Tomato & Lentil soups
Prego spaghetti sauce original
pure ground beef or turkey
Lipton onion soup mix (mix with sour cream for dip)
Sargento shredded cheddar cheese
Hershey's chocolate candy bar
Philadelphia Cream Cheese
Wavy Lavy's Potato Chips
Cheeto's
Cool Ranch Doritos
Hopefully this gives you a start of some of the items to keep available that need little or not preparation.
Good luck!
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