Party Element

Bought these longgg back to take it with me to gift to friends in India. Totally forgot about these after keeping them in cup-board. Because of longer Tennis sets did't get time to click any other shot and was searching for something interesting. Got another LAME idea but this one caught eyes..

One of the above 4 contains Water, Can you Guess ?
Why Water ? After seeing it one of my friends couldn't resist.. so.. You know.

** Straight out of the Black Box.
* The PINK hues are because of Fluorescent White Balance.