Shake the spirits with ice and strain into a highball glass. 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 glass with two ice cubes and Grape Fruit Juice instead. A Southern Bank is a South Bank which has 1 part Southern Comfort added.