[CupcakeDolly]

OH SNAP.
What if the wine was used in the cooking process, and Alabaster somehow mixed it up with his medication?
Or, alternatively, someone took the wine because it looked super yummy, thus leading 'Baster to fetch more, giving the killer time to wander in and poison the food with the laudanum?

Edit:

Originally Posted by Illusion

Also
"Whoever the killer is would probably have had second thoughts about doing it if they had known we were going to be drinking some real wine tonight."

What does Dervy mean?

I think that was just an offhand joke about how the killer might have been less crabby and homicidal if they'd known they were going to get a decent drink.