對英文頗有認識的人, 快進來 急.....................

Use it if there is only one cup ( or one bottle ) of water
Use they if there are more than a cup ( or a bottle ) of water

use it because water is 不可數

it同they都得

but好多時都係用it

Please use "IT" for water.

i think that it should be IT

use "it ", because there is never a plural form of water; waters is not a correct word. Just go to http://dictionary.reference.com/browse/waters if you want to check it. Water is use IT!!!!!