What's the etiquette if a guy buys you a drink at a bar/pub?

renjisgirl12
Say you're at a pub/bar alone or with a friend, and the bartender/waiter gives you a drink from a guy (for example, in films/tv they say something like "compliments from the gentleman at the bar/in the suit" ) what should you do? Do you go over to them/invite them over? Do you drink it or leave it? Does it depend on whether you're interested?

What do you guys want to happen? Would you be offended if the girl drank it but didn't come over? (i. e. wasn't interested)
What's the etiquette if a guy buys you a drink at a bar/pub?
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