In a medium bowl, combine the sugar and water. Stir well until the mixture has the texture of damp sand.

Firmly press the damp sugar mixture into a clean silicone or plastic mold. Ensure it is tightly packed for best results.

Let the molded sugar rest undisturbed at room temperature for a minimum of 8 hours, or overnight, until it solidifies. After it has hardened, carefully extract the cubes from the mold and place them in an airtight container for storage.