Jello shot recipes can be really messy and tricky, but they don’t have to be! Have an injector or pitcher with a spout handy can help you create super clean, even layers. Also, be sure to let the first layer fully set before adding the next. You really need at least an hour for the red layer to set up. Finally, do NOT add hot water to the unflavored gelatin without dissolving it in cold water first! Otherwise, it gets a weird, clumpy texture.