In a large, handsome, stemmed glass, place several cubes of ice. Dash on a few drops of Angostura Bitters. Add a slice of lime. Fill with sparkling water.

This recipe yields 1 cocktail.

Exchanges Per Serving: Because the drink contains few nutrients and less than 20 calories per serving, the American Diabetes Association/The American Dietetic Association Exchange Lists for Meal Planning lists it as a Free Food, which means you do not have to count it in your food plan.