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
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.
This site has all you need to know about using dry ice. (I'm putting it in my halloween punch.)
How to Handle and Use Dry Ice
Put dry ice and water in a Halloween jack-o'-lantern and let the fun begin! - Anne Helmenstine
Learn how to make your own nontoxic smoke and fog effects using dry ice and hot water. No smoke machine required!
Edible Magic Potion is one of the coolest crafts for kids because it's edible science!
The Witch's Heart - This shimmery Purple and Red cocktail is the perfect halloween cocktail or party cocktail! Easy to make and tastes delicious!