Throughout Pottermore, you will be given the opportunity to collect Potion Ingredients beyond what you purchase in Diagon Alley. Here’s a listing of ingredients that can be found and collected.

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Pottermore Potion Ingredients

• Wolfsbane (“This plant is also known as monkshood, or aconite.”) — located at the bottom of the barrel outside Hagrid’s door. Chapter 8, Moment 3 — This plant is also found in Chapter 15, Moment 2 at the base of the tree to the right of the Leaping Toadstool
• Dried nettles — hanging from the eaves to the left side of Hagrid’s hut, Chapter 8, Moment 3
• Dried Billywig stings — “Rumour has it that they are also used to make the popular sweet, Fizzing Whizzbees.” located in the window to the right, Chapter 8, Moment 3
• Eels’ Eyes — on the floor in front of the suits of armors, Chapter 9, Moment 2
• Jar of bat spleens — lying on the floor, Chapter 10, Moment 3
• Horned slugs  — used to cure boils, hover over the last sink in the back on the left and it will rise up, Chapter 10, Moment 3
• Infusion of wormwood “By mixing an infusion of wormwood with powdered root of asphodel you can make a sleeping potion so powerful it is known as the Draught of Living Death.” — green bottle behind the galleon, Chapter 12, Moment 2
• Mistletoe berries — to the right of the Christmas tree with bubbles, Chapter 12, Moment 2
• Leaping toadstool — base of tree to your left, Chapter 15, Moment 2
• Unicorn blood — zoom in to the back on base of tree toward left, Chapter 15, Moment 2
• Salamander blood: “The blood of these small fire-dwelling lizards has curative and restorative properties and can be used in strengthening potions.” — bottle on the sink at the back of the room, Chapter 17, Moment 2
• Bezoar: “stone taken from the stomach of a goat, which will protect you from most poisons” — In the medicine cabinet in the back, right side, second-from-bottom shelf, Chapter 17, Moment 2