Shake the spirits with ice and strain into a Highball. Fill with Grape Tonic and stir gently. Serve with a Lemon Slice on the Rim and a Straw. If you find the Grape Tonic too sweet, add a splash or two of Lemon Juice or Sour Mix. A Sour Bank is made in an Old Fashioned with two ice cubes and Grape Fruit Juice instead. A Southern Bank is a South Bank which has been added 1 part Southern Comfort.