Sprinkle packets of gelatin over cold water to "bloom".
Add Champagne or Sparkling Rose and 1/4 cup sugar to a small saucepan. Heat to a simmer over medium-high heat.
Stir in the gelatin and whisk until it is completely dissolved.
Remove from heat and pour into a pyrex/icecube tray/mold.
Allow to cool for 1 hour in the fridge.