Ice teas. Specifically raspberry ice tea, either unsweetened or lightly sweetened. My favorite brand thus far is Tradewind's Raspberry Iced Tea, which can be bought by the gallon.
Second favorite would be the Arnold Palmer Half n' Half, which is part ice tea and part lemonade, lightly sweetened.
As weeaboo as it sounds, I ADORE good macha green tea, like the kind ya get for a tea ceremony. It's like, amazing >< . Other than that I tend more towards just well, water.
Depends on the moment of the day. In the morning I tend to go for lighter teas like generic English blend or a Dutch Orange blend. Later during the day there's only 1 option really and that's a decent Earl Grey.
Important detail: ADDING SUGAR TO TEA IS BARBARIC AND RUINS THE TEA.
i used to drank a lot of coffee, i stil have some cups once in a while since i live in a caficultural country so coffee is really good here but since i was over exceeding with caffeine i started to drink Chai tea instead its pretty good for waking up in the mornings.