This is a very simple yet cool idea that could perhaps work well now that trading/markets have been a very active and real thing - more than ever before - in the last few worlds with Visitor debuff and such...
First of all, I was going to suggest two things. This and wine aging, but since wine aging was already suggested, I'll just drop the link:
viewtopic.php?f=48&t=54608&p=746579#p725008
Now for the branding...
As I said, very simple idea:
Right clicking with a parchment on a drink Bottle allows you to "brand" the drink. Literally like a bottle label.
You could name different drinks, beers, wines, etc... have famous brands known for their qualities and such.
And if aging is ever implemented, branded wines could also include the "bottling date" (in-game day) so you know how old that wine is. "Oh, look, a bottle of Wulfkin's special blend from day 150!"
It's a simple/silly idea but I guess it could add another layer of fun to the game.