Sometimes when looking for 'free food, discouragement can set in because of the prevalence of wheat and dairy in popular recipes and foods.
But consider how many foods are completely naturally wheat (gluten) and dairy free!
Meats are naturally 'free. Beans of all shapes and sizes. So is rice.
A walk down the produce aisle (or garden row) will make your list grow super fast--carrots, broccoli, cucumbers, lettuce, tomatoes, green peppers, green beans, peas, collard greens, squash, potatoes, mushrooms, oranges, bananas, apples, lemons, pineapple, strawberries, grapes, blueberries, melons,...
...yeah, even olives.