Add the water, mango nectar, sugar, dragonfruit powder, and citric acid to a medium saucepan and heat over low heat. Whisk continuously until the dragonfruit powder and citric acid are dissolved, then remove from heat.
Allow the mixture to cool, then transfer to a large jar with a lid. Once cool, make your refresher!
Make the refresher: Pour ½ cup Mango Dragonfruit refresher base over ice in a tall glass, then top with water or lemonade. Add freeze-dried dragonfruit (this will make the drink purple). Drink up!
Notes
This makes 2 cups of base, enough for 4 drinks. Store any leftover refresher base in the fridge for up to 1 week.