I take 0.3 litre bottle of water to school o.o Schoolmates can't believe it's enough for me xd
I prefer to have some drink in school, I might want to drink once and I will not be able to. And when I've water, that's not pity if I don't use water ;P
Olol, I usually drink 1,5l bottle of mineral water everyday + all the other drinks. Just when I sit by the computer, I have water and I drink it D: