IIRC, you can avoid getting "barrelled" by drinking the item that appears in your bags before the timer runs out. This can be done via macro, /use "insert name of barrel here"

Or you can fill up your bags, thereby preventing the booze from entering your bags in the first place. The macro is more practical. Or maybe put it on an action bar slot or jamba item etc.

I may be wrong though, I haven't done direbrew in a couple years.