Just me and you. Can I interest you in a beverage? First one's free.

"Hello, randomly appearing napkin," she says, bemused. "Alright, what kind of beverages do you have?"

I'm the bar. You may call me Bar. And I have everything.

"Hello, Bar. Is there any particular reason I got you instead of the bar I was trying to get into? And when you say everything, do you mean everything one would expect a bar to have, or every form of liquid that exists?"

I cannot distribute things, even liquids, that are magical, living, particularly hazardous, or in overlarge quantities. The door's behaviors are not under my control nor subject to any obvious pattern, but the mechanics of the door are such that when you exit and let it close the original destination of the door you opened will reassert itself in the place of Milliways, and while you are here with it closed, time in your world will not pass.

"In my world? I'm in a completely different world?"

Milliways qualifies as its own world under some but not all definitions. Certainly you are no longer in your original world.

"Wow. And no time is going to pass before I get home, hm. Too bad my Klaudia's not in shouting distance, she'd love to see it, I bet. Ooh, how specific can these drink orders get?"

Arbitrarily in theory; in practice limited by your ability to communicate your preferences using a common reference frame.

"If I say, some of my wife's blood before she was turned, can you do that?"

Not knowing your wife or having her or some of her blood here to look at, alas, I cannot.

"What about some of my blood from before I was turned? I've never tasted that."

A wineglass appears with the requested blood. Enjoy.

"Thank you." sip "Mm, nice. Not as good as Klaudia's, but still, very nice."

The door opens.

"Oh, hello. Come on, sit down. It doesn't look like there's a bartender, but the bar--itself? Herself? Himself? The bar is sentient, and communicates by napkin!" Gloria waves her handful of napkins."

"That was my reaction, when I came in! I mean, it was slightly less odd because I was trying to get into a bar anyway, but still."

"I was trying to get out of a nest of demons that I've finally cleared out, and this should have led to the back of the dollar store they were hiding out behind."

"Not the term I'd use, but when some lizard critters are sacrificing progressively larger numbers of progressively larger vertebrates to their dark pantheon - especially when they have gotten as far as 'sixteen assorted dogs' and aren't slowing down - they are being monsters and I take it upon myself to hunt them."

"Huh. I don't think I'd heard of any creepy lizard cults, which is probably a good thing. Kudos for fixing the problem before it got too public." She toasts her with her glass and takes another sip.