Looking for citrus power? Look no further... Fentiman's Premium Indian Tonic Water (formerly called Fentiman's Tonic Water) is a wonderful tonic with a lot of citrus flavor that comes from the use of lemongrass and other herbal infusions. When combining it the right gin that can match the power from the tonic like the Caorunn, Plymouth Gin or Herbie Gin you will have a great GT. So just note that the citrus powered tonic needs its match.