performer shows an empty glass bottle or a water bottle to the spectator,
and places it on the table.
hand the menu to them. Have them look through the menu and get their
attention to the names of Cocktails.
are Campari Orange and Blue Hawaii, and they see "which do you
prefer?" on it.
Assuming that they choose a Blue Hawaii, the performer takes the menu
back and put it in front of the empty bottle.
he does the magical gesture upon the menu and the bottle.
When he lifts the menu, they see now an blue silk appeared in the bottle.