The old drunkad Zadok is drinking his whiskey at the docks.
Talk to him about his drinking until you get to know that he has never tasted coffee.
This is the low-spoiler guide for "Help Zadok stop drinking" puzzle in Gibbous - A Cthulhu Adventure. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.