Blood Orange and Elderflower Flavoured Tonic Water. The London Essence Company, Blood Orange and Elderflower Tonic Water has a unique layering of rich and tangy blood orange oils, distilled elderflower essence and a touch of quinine to achieve the archetypal sharpness of tonic. This delicate flavour combination provides a floral finish, carefully carbonated for an exceedingly refreshing drink that performs just as well alone as mixed. The London Essence Company Blood Orange and Elderflower Tonic Water is an exemplary choice for pairing with floral gins, premium vodkas and tequilas.