1. Pour boiling water over tea bags; cover and steep 4 minutes. Remove and discard tea bags. Stir in 1/2 cup sugar until dissolved, adding additional sugar (up to 1/2 cup) if desired. Combine tea, whiskey, and next 3 ingredients in a pitcher. Cover and chill 1 to 4 hours. Stir in seltzer water. Serve over ice.
Note: We tested with Triple Sec orange liqueur.