Milk and Water Separation

The magician shows a glass of water and a glass of milk.
They're poured into a bottle and mixed.
The bottle is then placed on a tray, while the two empty glasses are placed on either side of the bottle and covered with two chromium plated brass covers.
Now from an distance, The Magician gives passes and earlier the mixture is seen to diminish in the bottle.
Ultimately the bottle becomes empty.
when the glasses are uncovered, it is seen that one glass is filled up with water while the other one is filled up with milk.

Contents:
1 Gimmicked Tray
1 Gimmicked Bottle
2 Gimmicked Aluminum (Chromium plated brass) Covers
1 Funnel
Full Instructions