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Pour your water into a mixing bowl. Then, add the gelatin powder. Stir the powder into the water until the jello is completely dissolved. Times will vary depending on the precise heat of your water, but jello usually melts within a few minutes. Once the gelatin is dissolved into the water, pour in your vodka. Use a mixing spoon to stir in the vodka until you have an even, consistent mixture. Pick a measuring cup that has a tip on the end. This helps you pour the gelatin mixture into your shots.

Summary:
Combine the jello powder and hot water. Mix in the vodka. Transfer your mixture to a measuring cup.