Heat water and gelatin in a small saucepan over medium-high heat. Whisk until dissolved, about 5 minutes. Add mango puree, sugar, and lemon juice; whisk until dissolved, about 5 minutes. Take off of heat to cool slightly, about 5 minutes.
Whisk vodka into cooled mixture.
Add a few drops of chamoy and a sprinkle of Tajin® to twenty 2-ounce cups. Fill evenly with mango gelatin and sprinkle with more Tajin®. Let set in a refrigerator for 4 hours.
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