Combine gin, Campari, lemon juice and liqueur in a bar tin with ice. Shake vigorously for 15 seconds, strain over fresh ice into a glass and top with sparkling water. For a batch version, combine 8 ounces of each ingredient into a pitcher or bottle, store in the fridge and distribute equally into rocks glasses filled with ice when you’re ready to serve each drink. Top each glass with a splash of sparkling water and garnish with citrus zest or fresh kitchen herbs. Makes 1 cocktail or 8 for batch version.
