Username: booklover789
Drink: 
As boring as this may sound, my favorite drink is water.
Why: I'll list the reasons below.
~ I think soda is disgusting. The carbonation is just so strong that I can't even taste the drink! X( For this reason, I don't drink carbonated drinks AT ALL.
~ The only tea I've tried is Celestial Sleepy Time (which is a Camomile-flavored tea), and I HATED it. UGH. The weird minty flavor with a hint of savory flavor mixed in with the mint...YUCK. Even when I added honey to it, it was still disgusting.
~ I don't like hot chocolate. Something's awfully weird about drinking something that has the consistency of orange juice, but tastes like fudge...it's just really weird to me.
~ In general, I dislike hot drinks. I will usually only drink cold ones.
~ I'm technically allergic to milk, and even when my family gets the lactose-free milk, I STILL have allergic reactions to it if I drink too much. So, I have to pick and choose days where I can and can't drink too much milk, thus making it difficult for me to pick that as my favorite drink. Plus, I don't really even like the flavor of straight lactose-free milk - I prefer chocolate added to it.

But I still wouldn't choose to choose that as my favorite drink, because it's not.
~ Water is refreshing. No other drinks quench my thirst - sure, I'll drink lemonade and chocolate milk every now and then, and when I need extra energy I'll drink a cold mocha frappuccino...but it's not like these are my favorite drinks. I don't drink for pleasure - I drink to quench my thirst. And the only thing that really does that, for me, is water.
Edited for clarity.