Pour 6 ounces of vodka from the bottle and set aside for another use.

To the reserved vodka in the bottle, add vermouth, water, and brine until it reaches the top of the bottle. Put the top on the bottle and invert bottle to incorporate the ingredients.

Place bottle in the freezer for at least 4 hours and up to 2 months.

To serve, pour desired amount into chilled glass and garnish with olives.