Hello,
I just discovered that if you add up Autodrinking and Manual drinking you drink twice as fast.
All you need to do is get tired, then when your character starts autodrinking you simply start drinking from another vessel, and you effectively regain stamina twice as fast.
I believe this is a bug and thought it's worth it to share. Although not gamebreaking, it makes all tedious tasks requiring drinking a lot of water less tedious.