Make the Lemon Layer: Add the lemon gelatin mix to a small bowl. Pour in ¾ cup boiling water and whisk until the gelatin is fully dissolved, about 1 to 2 minutes.
Add the Vodka: Stir ¾ cup vodka into the lemon gelatin mixture. Let it cool for a couple of minutes so it is not piping hot.
Fill the Shot Glasses: Pour the lemon mixture into 16 shot glasses, filling each one about one-third full.
Chill the First Layer: Place the shot glasses in the refrigerator and chill until the lemon layer is fully set, about 90 minutes.
Make the Orange Layer: Add the orange gelatin mix to a clean small bowl. Pour in ¾ cup boiling water and whisk until fully dissolved.
Add More Vodka: Stir ¾ cup vodka into the orange gelatin mixture. Let it cool for a couple of minutes before adding it to the shot glasses.
Layer Over the Lemon: Carefully pour the orange mixture over the set lemon layer, filling each shot glass about two-thirds full. Make sure the lemon layer is fully firm before adding the orange layer, or the colors may blend together.
Chill the Second Layer: Return the shot glasses to the refrigerator and chill until the orange layer is fully set, about 90 minutes.
Make the White Layer: Add ½ cup boiling water to a clean small bowl. Sprinkle in the unflavored gelatin and whisk until it is fully dissolved.
Add the Creamy Mixture: Stir in the sweetened condensed milk and ¾ cup vodka until smooth and fully combined. Let the mixture cool for a couple of minutes before pouring.
Finish the Jello Shots: Carefully pour the white mixture over the set orange layer, filling each shot glass to the top.
Final Chill: Refrigerate the jello shots until the white layer is fully set, about 90 minutes. Serve cold and keep them for adults only.