Gin & Tonic – – London Dry Gin, Fever Tree Tonic Water, citrus (orange, grapefruit or lime), ice, In an old fashioned cocktail glass, pour a jigger and one half or more of gin in the glass. Add 3 to 4 ounces of chilled Fever Tree tonic. Slide the citrus slice down the side of the glass. Add ice on top and stir slightly with a straw. Serve and enjoy immediately. Repeat this perfection.; –