After Dumbledore left, Alistair stayed in touch with Fred and George. During this time, he also wrote a letter to Snape and sent him some potion ingredients.
Snape's reply was brief, simply telling him that everything was proceeding as usual, and he sent back a bottle of potion in return.
Alistair placed the bottle of potion into his collection cabinet, then turned back to continue working on his own potions.
Chapter 322