MATERIALS: A METAL cap of some sort of bottle. I used a Starbucks coffee frappuccino cap.
You can get this from Walmart, Target, Publix, and i think Kroger. They also sell these sorts of things in little refrigerators near checkout lanes in various stores. NOTE: when you open the drink the 1st time, the metal cap should pop up, this is how the sound works Once you drink the beverage, keep the, once again, METAL cap. Take the metal cap with you when you are filming.