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Polyjuice Potion
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Fluxweed
Boomslang Skin + Horn of Bicorn
Slytherin Hair
Stuff
You can only get the Boomslang Skin and Bicorn Horn if you have brewed a swelling solution!
click watch how to brew a swelling solution
Once you have either brewed or been gifted a swelling solution, you must go back to the moment called "Snape's Office" in chapter 5.
There is a door in Snape's office to his private stores.
If you have a Swelling Solution then the door will be open and you can collect the ingredients.
If you DO NOT have a Swelling Solution, the door will be closed.
You need Boomslang Skin and Bicorn Horn for a polyjuice potion.