You're welcome! (I didn't want to give too many spoilers haha.) After you put in 4 of the 5 correct ingredients, something (well someone) moves- click there!
The medicine is not a correct ingredient! I think you've gotten 3 of the correct ingredients now but the 4th ingredient is a hidden ingredient (not found through solving the dream). Maybe there's something/someone on the moon! Then on the cooking screen will you be able to find the 5th ingredient.