Can Or Water

It seems like you are asking about a food or drink that is commonly found in restaurants in the USA and can be served in a can or a container with water. One possibility could be canned or bottled iced tea. Iced tea is a popular drink in the USA, especially in the southern states, and it can be found in many restaurants. It can be served either unsweetened or sweetened, and sometimes it is flavored with lemon or other fruits. Iced tea can be purchased in cans or bottles in grocery stores, or it can be made in-house and served on tap in restaurants.