You start to get at least 2 contestants. The more the better. You need to prepare any type of juice (orange, pineapple, etc.) but with a twist… put it inside a “small size baby milk bottle”.
To make it exciting, you have to cover these bottles with something like rolled paper or cardboard before the start of the game. Don’t let them know that the juice is inside the bottle. Put these bottles in front of them on a table and “on mark, get set, go!” they have to open the bottles themselves and will be surprised that the juice is inside the milk bottle. They will have to drink it like babies. The first one who drink it all wins.