Muddle 3 strawberries in the bottom of a glass or cocktail shaker and pour in the aquavit. Pour in the orange juice, then add the bitters and stir. Fill a tall double old fashioned glass with ice and strain the cocktail into it (this will take some patience and effort as the muddled strawberries may clog the strainer). Top with sparkling water. Garnish with the remaining strawberry and orange twist.