While you're waiting, lay out about 30 tall jello shot cups on a cookie sheet.
Mix 1 cup of the boiling water with the lime jello in a mixing bowl with a spout. Make sure all of the sugar crystals have dissolved before going to the next step.
Add in 1/4 cup fresh squeezed lime juice, 1/4 cup Chambord or other raspberry liquor and 1/2 cup vodka.
Fill the jello shot cups about 1/3 full.
Put on the lids and refrigerate until set, about 2 to 4 hours
Yellow Jello Layer
In a mixing bowl with a spout, dissolve the package of lemon jello in 1 cup of boiling water .
Mix in 1/4 cup fresh squeezed lemon juice, 1/4 cup Limoncello and 1/2 cup vodka.
Let the jello sit until it has cooled down to room temperature, about 20 minutes.
After removing the lids, carefully pour the lemon jello on top of the purple jello in the jello shot cups until they are about 2/3 full.
Put the lids back on the jello shot cups and refrigerate until the lemon jello has set, usually 2 to 4 hours.
Green Jello Layer
In a mixing bowl with a spout, dissolve the package of lime jello in 1 cup of boiling water.
Add in 1/4 cup fresh squeezed lime juice and 3/4 cup vodka.
Let the jello cool until it has reached room temperature, about 20 minutes.
After removing the lids, carefully pour the green jello on top of the yellow jello in the jello shot cups until they are almost full.
Put the lids back on the jello shot cups and refrigerate until the lime jello has set, usually 2 to 4 hours
Notes
While not absolutely necessary, putting jello shot cups on a cookie sheet makes transporting them back and forth to the refrigerator much easier. And the cookie sheet also catches any jello that might spill while you are filling them.
Using a mixing bowl with a spout will make filling the jello shot cups easier.
To make sure that you don't make holes in the previous jello layers while pouring, you can either pour the jello over a spoon or pour it slowly down the side of the jello shot cup.
The amount of alcohol in the jello shots can be adjusted to taste as long as all of the cold liquids combined together come out to 1 cup.
Jello shots can be made a few days in advance and stored in the refrigerator until needed.
A non-alcoholic version of these jello shots can be made by replacing all of the alcohol with water.