So I've got this thing, you put water in a bottle with some flavor stuff and it makes soda. I was thinking about trying this with a beer. I'd siphon out a bottle before I add the priming sugar mixture to the batch and use the force on it. Think this is a good idea?
If you do a search, I'm pretty sure this has been discussed at some length, with the eventual conclusion that it's not worth the effort; I could, however, be wrong about that conclusion, so I'd start off in the search box!
i have a sodastream and i remember the instructions tell you to add anything sweet after you carbonate or it would foam up, like shaking up a bottle of soda i guess. give it a try and tell us what really happens.