Thirstmonger 

Someone who is adventurous with drinks. They like to try different unique drinks and not the same old stuff.

A thirstmonger won't like that drink, it's nothing special.

Thirstmonger by db207 August 17, 2012

ThirstMonkey 

Being abnormally thirsty or desperate in a particular situation. Frequently seen in the bar, club or singles scene.

Man, did you see the girl he tried to hook up with? The ThirstMonkey must have been biting his azz!

ThirstMonkey by Twoin March 1, 2009