A correct guess eliminates the player from the game and ensures they will not have to drink the cup.
The cup could be a pint glass, pitcher, or other vessel (large enough for all players to put one finger on the rim) that is filled with a sip or small sample of all players' own beverage prior to the start of the game.
[1] Fingers starts by a participant offering his empty or almost-empty pint glass, pitcher, or other vessel to be used as "the cup."
Each turn starts with all players putting one finger on the rim of the cup.
When all fingers are on the rim, the player whose turn it is announces, "three - two - one" followed by a number.