Spoilers ahead:
If you really need causality:
He wants you to get something to drink, because he is thirsty.
He is thirsty, because you challenged Bugeye in Pirate Face-Off for the first time.
He has to be thirsty at that point in order for you to give him the yellow bile, so you can get his face.
He can not be thirsty before, because otherwise you could get his face without knowing for what.
Yes, it is a seemingly random event, that is triggered by something else in the game.
But that doesn't make it unrealistic or anything because, believe it or not, people don't need any reason at all to become thirsty, plotwise.
I couldn't really imagine any logical reason, besides the fact that he just wanted a drink because he's thirsty.
Now you may think "But I don't like randomly triggered events that don't make sense", but I see it like this:
If you played Pirate Face-Off for the first time against Bugeye, you will then find out that you can ARR! at people and get their faces.
It only makes sense to get back up to DeCava to get his face too. And that is when he gets thirsty.
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