Make the Jell-O as you normally would (usually one cup of boiling water per package of Jell-O). Once you've mixed the Jell-O powder, add in 2/3 the amount of vodka as you used water (ie. if you used 3 cups of water to mix the jell-o, add 2 cups of vodka). Put it in the freezer to set, as vodka requires colder temperatures than regular Jell-O. If you have plastic shot glasses, these are great to chill it in as you can serve them individually. If not, serve with a spoon!