Stir together concentrates, 4 1/3 cups water, and bourbon. Stir in club soda just before serving. Serve over ice, and garnish, if desired.
Slushy Whiskey Sours: Stir together first 5 ingredients. Pour into a large zip-top freezer bag; seal. Freeze 2 hours. Spoon into a pitcher. Stir in club soda, and serve immediately.