Grate mate! You can do your own cognac!
Of course if you have enough will power to fill with barrel by holy water (grape spirit) and wait for minimum 3 years.
By the way in any case you will lose up to 15% from content of barrel, for evaporation through the pores and cracks in wood (it calls angel's share)
End it will be called "Old Growlers Cognac". Sounds great mate! hahahahaha