Abstract: A system of carbonizing water as part of making a carbonized beverage. There is a housing to contain the pressurized bottle of carbon dioxide, and also to define a chamber to receive a container of water. A pressure regulating valve maintains the carbon dioxide discharged from the carbon dioxide container at a predetermined lower pressure and directs the carbon dioxide to a selectively operable pressurizing valve that directs the carbon dioxide through a discharge nozzle into the water in the water container. The water container is closed by a mounting plug that interconnects with a receptacle block that is operably connected to the pressurizing valve, and also operably connected to a venting valve which is selectively operated to vent the remaining pressurized carbon dioxide after the carbonizing has been completed.