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Get out a silicone mold with about 15 small cavities. Spray the mold with a light coating of cooking spray. Take a paper towel and wipe away the excess oil from each cavity. Preparing the mold will make it easier for you to get the jello shots out. Set the mold on a baking sheet or cooling rack.  If you'd rather fill individual shot glasses, just set them on the baking sheet. Avoid using small paper cups since they may fall apart when you pour the hot jello mixture into them. Each cavity or glass should hold about 1 ounce of liquid. Transfer the silicone mold on the baking sheet to the refrigerator and chill the jello shots for at least a few hours until they're completely set. You can chill the jello shots overnight.

Summary:
Prepare your jello mold. Refrigerate the caffeinated jello shots for several hours.