Instead of a cauldron use a nice bowl-love potion, use dry ice, person(s) dressed as cupid to serve.
Dry Ice Fog, EASY HALLOWEEN Party ideas that will make you have the best party ever, fun games for kids on Halloween, where to get dry ice
This site has all you need to know about using dry ice. (I'm putting it in my halloween punch.)
How To Make Non-Toxic Dry Ice Smoke or Fog: When you drop dry ice in water, it sublimates to form carbon dioxide gas. The cold carbon dioxide is used for smoke or fog special effects.
Dry Ice Experiments for Halloween & Beyond
The Witch's Heart - This shimmery Purple and Red cocktail is the perfect halloween cocktail or party cocktail! Easy to make and tastes delicious!
Spooky Halloween Drinks - these drinks are perfect for your Halloween party. Seen here is the Bloody Vampire featuring dry ice for added spooky-ness
Put dry ice and water in a Halloween jack-o'-lantern and let the fun begin! - Anne Helmenstine
How to Handle and Use Dry Ice