Make the refresher base: Add the water, blackberry syrup, blackberry extract, citric acid, and ground sage to a medium saucepan. Bring to a simmer, stirring occasionally. Simmer for 2-3 minutes, or until the citric acid is dissolved and everything is well combined.
Remove from heat, transfer to a large jar, and allow to cool completely before using.
Make the Midnight Drink: Add ice to a cocktail shaker, then pour in ½ cup Blackberry Sage Refresher base and ½ cup sweetened coconut milk.. Shake a few times until well combined.
Add ice to a tall glass, then pour the Midnight Drink over the ice. Stir in fresh blackberries if desired, then drink up!
Notes
This makes 3cups of base, enough for 6 drinks. Store any leftover refresher base in the fridge for up to 1 week.