I no longer have to. I can make my seltzer as fizzy or as flat as I want. AND, if it loses its fizz, I can re-fizz it. How freakin' awesome is that? I made a bottle, drank a few sips and burped the biggest burp in the world. Ahhhh, so refreshing. Paul tried it, and made a funny face. He just doesn't understand the appeal of seltzer. I guess you just need to be an east coaster.
The box I got came with various flavors to add to the fizzy water. You can make actual sodas. Unfortunately, they're all sweetened with splenda, which is something I won't touch. But there are flavored stevia drops that you can get. I made some vanilla soda from some drops we had, which wasn't bad. It also came with unsweetened flavors, which will make some nice flavored real seltzer that I love. I can't wait to make myself a bottle to bring to work tomorrow. YUM!