XenonPirate

OK, so I have my science fair idea but I don't know how to test it. I am trying to test whether or not temperature of water changes How much CO2 will dissolve into it, and also whether or not adding substances to the water affects the same thing. However, the most scientific method of testing I can find is heating up some cola and sticking your tongue in it. Does anybody know a way I can find out how much CO2 will dissolve int water, with an actual answer in mg/l or g/l, using NON-SPECIALIST equipment? Thanks XenonPirate P.S. here is my aim ,if anyone can think of a way to actually test this and tell me ASAP it would me much appreciated. Aim I aim to find out whether the temperature of water affects the solubility of carbon dioxide in that water, and also to test if adding certain substances to that water effects the solubility of carbon dioxide in it.