Well, I had some nice Q vinegar in my high Q barrel. I wanted it out of the nice high Q barrel, so I tried picking up the barrel and right clicking on an empty one. This did nothing. I tried filling up a wine bottle and putting it into the empty barrel... The barrel would not take it.
So apparantly you can store vinegar in barrels, but you cannot put vinegar into a barrel that does not already have vinegar inside. Please, oh please... Fix this? I do not want to use my high Q barrel for storage.