Rinse 3 pounds of green grapes under cool running water to remove any dirt or residue. Gently pat them dry with a clean kitchen towel, ensuring they remain slightly damp.

Place the baking sheet filled with grapes in the freezer for about 15-20 minutes, ensuring they are chilled but not frozen solid.

Combine 2 small packets of unsweetened Kool-Aid with 1/3 cup of granulated sugar in a mixing bowl and whisk until thoroughly blended.

Divide the grapes into individual ziplock bags based on how many different Kool-Aid flavors you plan to make.

Add the prepared Kool-Aid mixture to each ziplock bag, seal tightly, and shake vigorously for about 30 seconds to coat the grapes evenly.

Carefully remove coated grapes from the bags and spread them out in a single layer on a parchment-lined baking sheet.

Place the baking sheet back into the freezer for a full 24 hours to ensure they become frosty and firm.