Before we started working on Harry Potter birthday decorations, I took the kids to Goodwill to hunt for supplies. We got several cool shaped bottles on the cheap, including for tiny vials with lids. They were perfect, and just what we needed to round out the few I'd managed to gather already.
For most of them, we used labels that I found online, but there were a few I made myself using free clip art and lettering from dafont. (I'll come back and add links in the morning.)
We used all sorts of things to make the "potions". Partially hydrated water beads as mermaid tears; craft store moss as gillyweed; water beads, glitter, glue, and paint for the polyjuice potion...
I discovered that if you put fully hydrated water beads through a food processor with a little extra water and some super fine glitter, you end up with a fantastic gel.
By the time we were done, we had bezoars, eel eyes, veritaserum, wolf's bane potion, pepperup potion, essence of dittany, drought of living death, felix felicis, skelegro, slug repellant, knotgrass, asphodel...
We ended up going a bit overboard with it, but who cares? We had fun. And I made more than just potions...
I'd recently found a little mushroom from a fairy garden kit that somehow never got painted and thought, I could use this! I paired it with a glass votive holder, three wood circles, a wood drawer pull, and more of the moss to make a little "leaping toadstool" specimen.
My daughter found a small animal skull almost a year ago, and it has been bleaching in the sun ever since. We put it inside an apothecary jar, and called it a "juvenile dragon's skull". It's a bit macabre, perhaps, but I thought it was a nice touch.