Make the Jello according to the directions on the package.
Allow jello mixture to reach room temperature.
Add your desired amount of tequila to the jello mixture. You can measure shot by shot or add about 1/2 cup per 3 ounce package of Jello. If you are making a large batch, use half of a bottle. Mix well.
Pour the mixture into the individual shot glasses. I found it’s easier to have the shot glasses on a tray before pouring to make transferring to the fridge easier. Each shot glass takes about 1/8 cup to fill. (Note: If you wish to garnish the tops with salt do this before pouring the mixture into the shot glasses)
Refrigerate the jello shots for at least 2 hours to allow the jello to set.