How do you ask a guy for drink?

So I’m interested in this one guy and he seems interested in me. We match each others energy pretty well. I mentioned I was single without basically saying I was. It went a little like “Drunk me is pretty entertaining but I’m surprised she doesn’t do more stupid shit like text guys.” He laughed thinking it was funny and then after that he asked what my favorite college football team was and I didn’t want to tell him, but eventually he got it out of me. I also did tell him about an airstrip that was close and he said he was going to fly to it, until I told him that the landowner is an a**hole. Like I said he seems interested, but I could be reading the signs wrong. I also want to be careful just in case he does have a girlfriend. So I’m thinking afterwards just saying “Thank you so much for all your help, I feel like I owe you a drink.” But is that too much or do you think that would work and again I want to be cautious in case he does have one.
How do you ask a guy for drink?
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