If you are after an easy alternative to a G&T, why not replace the Gin with the bitter complexity of Suze, for Le Petite Bouche (then simply add Rum, Orange Bitters and, of course, Tonic Water). This dry and refreshing aperitif was created by Danny Wilson at Tabouche in Cambridge, UK.
Add all ingredients to an ice-filled glass and stir
Grapefruit wedge