You could start with some valerian root, chamomile, passion flower, skullcap, Mullen... Steep any combination of the above in boiling water for 10 min. You'll have to play with quantities until you get a combination that works for you
the draught of living death contained valerian roots, sopophorous beans...that's all Rowling mentioned. Well it is unknown what excact ingredients are in the potion in Snow White and the Seven Dwarfs...
When you first get to the Shark Tooth Island, there is a guy giving out milk. Get milk and then go over to the guy giving out grass skirts. Get a grass skirt, go over to the ancient ruins and jump on...
this cannot be anwsered because there are hundreds of potions with diffrent recipes witches (and wizards) mainly use herbs and parts of magical plants, and ordinary onesbut sometimes also use animal...