glass of water riddle, plss help, i need to know riddle?

[L3G10NW]

if u have a glass of water, and the upper half of water is mine, and the other bottom half is yours, How can u drink ur half without drink my upper half ?

NOTE: u have to leave my upper half there, up.
no, u cant use an straw, cuz it makes my upper half get down. u must leave my upper half UP.

 

[wayfaroutthere]

Using a straw.

 

[LilyWhite1]

Use a straw. It won't draw in any of your water because the air in it blocks any from getting in until you start sucking on it.