I have three 25-30 liter Hungarian oak wine barrels full of wine at the present time. My wife has convinced me to take a three month winter vacation out of the Minnesota cold this year so we will be gone January, February, and March. I know that i can't leave barrels untopped during that time, so I plan on removing the wine from two of the barrels before leaving and either bottling or transferring to carboys depending on how they have progressed. Those two wines will have been in each barrel for at least six months anyway. The last full barrel is not scheduled to be emptied until June 2022. I know that I will probably have to remove that wine and store it in glass until I return. I'm just wondering if anyone has tried wrapping a barrel in shrink wrap to stop the angel's share from leaving the barrel. That's probably not a good option but it doesn't hurt to ponder. I am also wondering if K-meta and citric acid is the recommended fill while the barrels are idle. All three barrels have been through four batches or more of wine so I'm not too concerned about loosing oak flavor while storing.