Abstract: A post-mix beverage dispensing system including a cabinet having top, front, back, side and bottom panels for housing various components is disclosed. The components of the system include a carbonator for producing carbonated water by mixing cooled potable water with CO.sub.2. Potable water is stored in a portable tank means and is supplied to the carbonator through a first pipe. The portable tank is easily detachable from the cabinet. The system further includes a cooling reservoir containing cooled water. A serpentine section of the first pipe, along with the carbonator is disposed in the cooling reservoir. A CO.sub.2 tank supplies CO.sub.2 to the carbonator. Syrup packages dispense a selected syrup. Carbonated water from the carbonator, cool water from the portable tank, and syrup from the syrup packages are mixed in a valve and dispensed through a nozzle. The cooled water may be continuously supplied to the carbonator through the first pipe.