4th of July Jello Firecracker Shots

Ingredients

1-1/3 cups boiling water, divided
1 package (3 oz.) JELL-O Berry Blue Flavor Gelatin
1 package (3 oz.) JELL-O Cherry Flavor Gelatin
1 envelope KNOX Unflavored Gelatine
1 cup milk, divided
3 Tbsp. sugar
1/2 tsp. vanilla
20 maraschino cherries with stems, well drained, patted dry

Preparation method