Fountain drink
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A fountain drink is a soft drink, prepared locally from a supply of flavored sweetened syrup, carbon dioxide, and water, either manually (as American pharmacists of yore did), in a device called a soda fountain, or in a vending machine which is essentially an automated soda fountain that is operated using a soda gun. Today, the syrup often is pumped from a special container called a Bag-In-Box (BIB).
Also referred to as a post mix machine in some markets.