Most of the ingredients needed for Potions can be bought from the Apothecary in Diagon Alley. However, some of them are found in moments. These ingredients can be collected again and again by simply returning to the correct moment.
A list of which moment contains ingredients can be found here:
http://pottermore.wikia.com/wiki/Ingredients
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The letter was found inside the Letters from School moment. This has since been removed from Pottermore.
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The bogey flavoured Bertie Bott bean is found in the moment "Moaning Myrtle's Bathroom."