If you are traveling on a limited budget or if you lose all your money in a casino, here are some places where you can eat well without spending much money. Fast Food is readily available almost everywhere in the USA and is very inexpensive.
Pizza is sold everywhere.
They usually sell groceries, snacks, pastries, cold drinks, coffee, hot dogs, and sandwiches made to your order. They are very inexpensive. You can usually get a light breakfast or lunch for just a few dollars. Supermarkets sell many things besides groceries. Look for the soup and salad bar or the delicatessen and hot food sections.