Pretty much all I drink outside of booze is coffee and water. I can always have a coffee (unless I know I'm already at the point where one more cup will get me all jittery). No milk, cream, sugar, flavour shots, syrups, etc. C O F F E E.
I do also like Vietnamese green tea but I can't get the good stuff (from Thái Nguyên fyi) in Canada and I won't settle for less.
I will also on occasion enjoy an A&W root beer if I have a craving for an A&W burger.