POTIONS WALKTHROUGH

Bad Ending

(Lemmy slips a potion into both Sam and Bartholomew's drinks, destroying their relationship, and manipulating Sam into being with him)

Potion of Broken Hearts

To make this potion, you need a Bottle of Sludge and a Crow's Beak.
The bottle of sludge can be found in the top left corner of the first room. Push one of the wooden boxes into the spike pit to make room for the metal box, and it is easily accessible from there.
The Crow's Beak can be acquired by giving Alfie the Alligator (south room) a Dead Roach (north room).

Potion of Blinding Love

To make this potion, you need a Snake Tooth and Used Tissue (tears from Frankie)
To acquire the Snake Tooth, grab the Can of Soda from the east room, and give it to Simon the Snake (far west room).
To acquire the Used Tissue, grab the Tissue from the southeast room (you will need to ring that yellow bell first, so this room must be accessed from both sides to complete the puzzle), and give it to Frankie the Fish.

Good Ending

(Lemmy consumes the Potion of Introspection himself, and gains greater insight into his toxic and self destructive behavior)

Potion of Introspection

To make this potion you will need a Broken Mirror and a Sneaky Caterpillar.
To acquire the Broken Mirror, get the Shard of Glass from the room directly west of the starting room, and give it to Carmen the Cat. Carmen can be found in the room west of where you got the roach. (that room is also technically directly north of where you get the shard, although you cannot access the room that way)
To acquire the Sneaky Caterpillar, travel to the southeast room specifically from the room where Alfie is, in order to enter in on the ledge (where the bell is). On this ledge is a moving plant. That plant is actually a caterpillar. Walk over it to collect it.