Abstract: An installer comprising a supporting structure and a carriage adapted to carry a water bottle. The carriage is mounted on the supporting structure for movement along a path between a loading position in which the carriage is adapted to receive the water bottle and an unloading position in which the carriage is at a higher elevation than in the loading position and inverted with respect to the loading position. A stopper is mounted on the carriage for movement with the carriage between the loading and unloading positions. The stopper is movable between a closed position in which it essentially closes a mouth of the water bottle and an open position in which the stopper is displaced from the closed position. A cam system is carried by the supporting structure and is responsive to the carriage approaching the unloading position for moving the stopper from the closed position to the open position.