Serving a single special cocktail is a clever, fun way to start a party. Bitters are sold in a small bottle and are available at most grocery stores.
6 oz. white vermouth
6 oz. red vermouth
Sliced limes, or rhubarb spears
Step 1: Fill 6 tall glasses with ice. To each glass, add 1 oz. of each vermouth. Add several dashes of bitters and fill glass with soda water. Garnish with limes or rhubarb spears.