To prepare the SodaStream sparkling water: Fill a Sodastream 1 Litre Bottle with cold water and carbonate.
Muddle blueberries and basil leaves with a fork. Add the blueberries and basil to a jug, along with cranberry juice. Add 1 litre of sparkling water and mix well.
For each cocktail, add 250ml of the flavoured sparkling water. Add the bitter orange liqueur, stir, then top with plenty of fresh ice.