You Wake Up In A Bar

Voting for a Combo of the two names above;
Drinkmaster Moonshine
and call the bar Valhalla
Maybe call the Bar the Unshaken. Y'got a potent Mixmaster Artifact, can't hurt to advertise it.

Thank Your Unknown Patron, Introduce yourself, cautiously imply that maybe they'd like to reciprocate your introduction, if they really really want to, and ask them if there's perhaps a Specific Cocktail they would enjoy (and the composition thereof) because if you're doing this as a Job then it might be nice to start off knowing at least one recipe and they deserve something actually appealing for the help they've given you. On The House, if that won't break some Deep Bartenderly Code, and as Payment for telling you how to make the cocktail in the first place, if it does