Why the an-dràsta?
A bheil deoch agad? "Do you have a drink?" seems to not need the extra embellishment.
Are you having a drink? should also be possible
Mmmm. I'm going to say no. Having a drink is a' gabhail deoch.
I'm going to agree with tj4234 here. It's not the same meaning.
Would "Did you have a drink just now?" be acceptable for this as well, or is there a more accurate way to say that?
"Do you have a drink just now?" feels a bit awkward.
"Do you have a drink just now?" = "Have you got a drink just now?"
It's referring to possession, as opposed to taking a drink of something. In other words, it's asking if you are currently in possession of a drink :)
Ok, I think maybe it was the "just now" that threw me off a bit. Tapadh Leibh :)