wouldn't carbonated water be CH2O? If so then I don't see how the plant would be extracting CO2 out. I'm just going from logic here I'm not an expert. Also i've heard about all the Dry Ice stuff and I just have to say that having stuff like that is NOT REQUIRED! Most the first time growers will read something like this and decide "I have to do that" and end up fucking up their plants.

Don't overdo anything. Think of them as literally being your daughters. You want to make them happy without spoiling them. Make them beautiful women...then smoke them. But if they decide to grow balls. Cook them alive and make some hash. ;D