Simmer the frozen mixed berries and sugar in a pan over medium heat until it reduces and thickens; about 5 to 7 minutes. Allow to cool for 5 minutes. Puree in a blender or food processor. Cool completely. (You can optionally press the mixture through a fine mesh sieve to take out the seeds, if desired, but consider increasing or doubling the recipe to compensate for some of the lost fruit.)
Dip a finger in the cream of coconut and trace the rim of the glass. Dip the glass in a plate of unsweetened coconut flakes or colored sugar crystals.
Scoop 1 Tablespoon of the cream of coconut and 1 Tablespoon of the berry reduction in a 9 oz glass with a little ice. Fill the glass with DASANI Sparkling Water Berry Flavor. Stir lightly with a straw and enjoy!