Use only tonic water to make shots REALLY glow. WARNING: this will make the shot fairly bitter.
2 oz tonic water
2 packages jello (2 flavors-you choose)
1 cup water
1 cup vodka
1. MAKE THE FIRST LAYER: Pour one cup tonic water into a pot over high heat. Once boiling, add one of the jello packets. Whisk until the mix is dissolved, then pour in 1/2 cup water and 1/2 cup vodka. Stir to combine.
2. Pour the jello mixture into shot glasses, filling them about 2/3 the way up. Place in refrigerator and chill for 30-35 minutes.
3. MAKE THE SECOND LAYER: As they set, start making second jello mix following the same process used to make the first jello mix.
4. Top off shot glasses with second jello mix and return shot glasses to fridge. Let set for 2-3 hours before serving.