How do you get a Cup of Oil ? I have tried every recipient in a barrel of oil and I cannot seem to be able extract it.

Also, I read this on a forum but I cannot get them to work:

- Fire Arrowhead + Barrel of Oil = Smokecloud Arrowhead.
- Stunning Arrowhead + Barrel of Oil = Smokecloud Arrowhead?
- Normal Arrowhead + Water Flask = Water Arrowhead
- Chilling Arrowhead + Chilling Arrowhead = Freezing Arrowhead
- Fire Arrowhead + Flask of Poison = Explosive Arrowhead.
- Stunning Arrowhead + Flask of Poison = Poison Cloud arrowhead