magic swirling potion - tutorial in link. Potion will settle, not sure how quickly, so I'm not sure if it's suitable for a bottle vignette or not. Perhaps adding tulle or something to the jar would help suspend the particles?
Keep all spirits contained inside your potions bottle with these ghoulish wine stoppers. -- This list is for ONE decorative wine bottle stopper, matt black, featured in the solo photo. -- These are(Bottle Painting Diy)