No Outlet/guide

Drunk
Enter the green door. Go north-east and interact with the big bottle.

Rainbow
Enter the pink door. Enter the doorway on the right. Go right and down the hall. Go along the hall with white roses and through the doorway. Walk down the hall and after a while go back the way you came. Interact with the multi-coloured rose.

Witch
Enter the orange door. Follow the forest path: Up, Right, Bottom-right, Down, Down and Up. Enter the house. A cutscene will play when you try to leave and you'll be teleported to the Nexus. The effect will now be in your inventory.