Inspired by Halloween: A Sweet Sip

For this Halloween themed writing prompt, take a sip of spooky creativity. The fluid in this glass is made from many things, one being a specific part of a spider. Which part is it? What does it taste like? What does it do? Is it a potion or a weird cocktail brew?

Write a scene where your main character gifts this bottle to a friend–or foe–and explore what happens when they ingest it–or even refuse.