There already is a competitor. It doesn't take a ton of expertise to attach a regulator and carbonation cap to a co2 tank. Doing it this way, it costs me $20 to

There already is a competitor. It doesn't take a ton of expertise to attach a regulator and carbonation cap to a co2 tank. Doing it this way, it costs me $20 to get the tank filled, and I can use regular soda bottles.