OK,
At work, English teatime tea (Bigelowe, I think). I down about 8 cups a day. Big cups.
At home, krazykemist is dead on, Vanilla Coke all the way with two exceptions:
After 8 at night, I can't have caffine, so I switch off to Yeo's Vietnamese style soy milk. Ratbastid (you fargin icehole!

), if there was anything you liked about soy milk that the chalky, pasty taste obscured, it's in this stuff. Sweet, light bodied, and very refreshing - not heavy and chalky like American style.
When it's super hot, cola doesn't do it for me. Then I mix ginger ale, cranberry juice and grapefruit juice (in varying proportions).