I'm trying to find out too and I know it says in David McCullough's Biography of him but I can't remember what it was. I remember it was something that not many people liked and he developed the habit of drinking it while studying at Harvard. I'll have to search the book.
I think it was apple cider.
Milk, Tea
what is john adams favorite car
john adams jr.
His favorite drink is... bourbon.
John Wayne's favorite drink was Sauza Commemorative Tequila.
Platypus
Meatballs
The bible
Organ
Meatballs
Meatballs
nothing depending on the internet