How to Make It
Stir together hot water and sugar until dissolved. Stir in lime juice. (Store limeade in refrigerator up to 7 days.)
Stir together 1 1/2 cups limeade and tequila in a wide shallow pan, such as a round cake pan.
Stir together coconut water and blue curacao in a second wide shallow pan, such as a round cake pan.
Freeze both mixtures for 3 hours, and then use a fork to scrape partially frozen liquid into shards. Freeze shards another 2 hours, and equally divide both mixtures among 4 coupe glasses.