Combine all ingredients in a cocktail shaker or mason jar and fill it ¾ with ice.
Shake until chilled, then strain into a highball glass filled with ice.
Garnish with kiwi and mint, if desired.
Notes
Make it a Star Drink:Transform this Kiwi Starfruit Refresher into a creamy Star Drink by replacing 1 ounce of the water or tea with 1 ounce of coconut milk.