Hi all I have been trying to make a co2 setup. I am not having any luck. It will start to bubble after a little time then it just stops. I am using: 2liter bottle 2 cups sugar 6 cups water 1 tsp baking soda 1 package of yeast. I have even added a valve to slow down the release. Just can't get it to work after a couple hours. Am I doing something wrong?? Thanks for any help. Erik