Make sure you get the right size bands for your coin!
I use Sean Taylor's opening for my routine but finish it with their cool self devised bit.
I push the coin through the bottom of the bottle and then say that it can't come out the neck and shake it upside down. Lodging the coin. I then place the duplicate coin on the side of the bottle and slide it along the side until it is on the bottom at the same time taking out the folded coin. By holding the coin loosley on the bottom and by the bottom by the neck and shaking, it makes the sound illusion the coin is still in the bottom. I then ask the spectator to try. The pick up the bottle from my hand, shake it and coin is no longer there but on my out streched hand.
The routine works well because the heat is always off the moves.