We used edible ingredients instead of real ones. I dug out some old baby food jars that I have been saving, for who knows what, but they came in very handy for our purposes. I printed out labels with a creepy font and we set to work.
Addison had to really get into the part and put on her best witches costume from her dress up. She even wanted me to get the Halloween costumes down from the attic. That was a bit much for me and was the bad guy and said no.
Here is the list of ingredients (courtesy of Story of the World Activity Book):
Fingers: tootsie rolls
Eye of Newt: chocolate chips
Tongue of Dog: red licorice
Lizard's leg: pretzel sticks
Owlet's wing: mini marshmallows
Sale of Dragon: smarties
Tooth of Wolf: candy corn
Gall of Goat: raisins
Baboon's blood: Grape juice, cranberry juice, red Kool-Aid or red colored water
Have fun bubbling up your own brew!