Homebrewed
Please don't look at the source code for this puzzle. (This note is not part of the puzzle.)
It's said that those who understand their ingredients will find recipes even within them.
You come to a cauldron in an old house in the town. It looks like there's enough space to fit four ingredients into it.
After you're done mixing the requisite potions, discern their true nature and sample them in these quantities: 2, 4, 5, 7, 8, 1, 4, 7, 5, 2, 7, 5, 5, 10, 5, 7, 8, 7, 11, 9, 2, 5, 6, 6, 1, 6.