Witch's Potion/Quick guide

Details
'**NOTE** It is advised to gather all ingredients required, EXCEPT for the rat's tail, before following this quick guide'!

Getting Started

 * To start, talk to Hetty in her house in Rimmington.

Obtaining the rat's tail

 * Kill a rat in the archery store directly west of Hetty to get a rat's tail.

Obtaining all other ingredients

 * Burnt meat: Buy from the Grand Exchange or from other players. Alternate: Run to the Crafting Guild and kill a cow. Take raw beef. Run to the house north of Hetty. Use raw beef on range to obtain burnt meat.
 * Eye of newt: Buy for 3gp from Betty.
 * Onion: Pick from the onion field north of Remmington.

Finishing Up

 * Talk to Hetty while carrying all four items.
 * Drink from the cauldron.
 * Congratulations! Quest Complete!