Dont drop the bottle!
Toss the beer bottle up, and try to catch it.
See how many times you can catch the bottle in a row without dropping it. Simple, right?
Carefully time your release and time your catch. It can be very tricky, but once you get the hang of it... it will still be hard.
Tap once to raise the arm, tap again to release the bottle, tap once more to close the hand to catch the bottle.
Good luck, and try not to break your phone!