We used a propel bottle and screwed a tire pressure valve onto the top. We then fit a valve onto a hose that conected to a c02 bottle. You hook up the bottle and turn on the gauge to 20psi. You then turn the bottle over and shake until the slight bubbling noise has stoped. This means that the C02 has mixed into the liquid. You let the bottle rest for 5 minutes and then crack it open. Apple juice and orange juice were amazing. We are now going to make our own soda and carbonated liquor.