Keep them in the fridge for longer, the carbonation will go down over time. Also, try placing the bottle in a container or bowl, then hold another (slightly na

Keep them in the fridge for longer, the carbonation will go down over time. Also, try placing the bottle in a container or bowl, then hold another (slightly narrower container) over the top of the bottle. You should be able to catch all of the liquid in the bowl to pour into a glass. If you added a bunch of sugar and/or flavoring into the secondary fermentation / bottles, you added too much. If you didn't add anything, then you didn't let the primary fermentation go long enough.