I just setup my DIY c02, and everything is air tight but it doesn't seem to be producing any bubbles, i has been about 6 hours almost and nuttin yet I used the resipe in the sticky ( 3cups sugar, 1 teaspoon of yeast), however i didn't have any baking soda but i rad elsewhere it was optional, is this why it's not working??? Any suggestions. It's a 2l bottle that tuns thru a DIY bubble counter made out of a 600ml pop bottle.