You can get one free food, for life, from any one restaurant, but it can only be one type of food.
For example, if you said "cheeseburgers," you can get any different type of cheeseburger (Big Mac, Quarter Pounder, Double Cheeseburger, etc) from a McDonalds restaurant, but could never get a free chicken sandwich, or McNuggets, or salad or anything. Only one free item a day. Delivery is allowed, but the delivery fee is not.
I'd pick pizza and have it be from a local place I know called Johnny's Pub.