In a medium saucepan, combine water, mango nectar, granulated sugar, dragonfruit powder, and citric acid. Heat over low heat, whisk continuously for about 3 minutes until smooth. Remove from heat and let cool.

Pour the cooled refresher base into a large jar with a lid and store it in the refrigerator.

In a small jar or glass, combine oat milk (or cream), strawberry syrup, and soy milk. Froth until pale and whipped.

In a cocktail shaker filled with ice, combine refresher base, sweetened coconut milk, and freeze-dried dragonfruit. Shake vigorously for about 15 seconds.

Strain into a tall glass filled with ice. Spoon strawberry cold foam on top and garnish with freeze-dried dragonfruit and sprinkles.