One of the kegs can have carbonated water in it. I have one of Ross's setups with 3 kegs/ 3 taps, and the left tap always has water. The water at beer serving pressure is not as fizzy as normal soda water, but it is excellent having cold fizzy water on tap. I drink it straight, while the wife and kids add cordial etc to it in the glass.
QldKev
QldKev