I have an evil PC in my game that, as the DM, I want to assist in making a surprise against the other players. The idea is that they go to the tavern and have a few drinks before the big final battle we have planned. During this time, the rogue in their party is going to slip Midnight Tears poison into their drinks, using a sleight of hand check to successfully do it.
My question is, he has only 1 vial of this poison. Can one vial be divided into 4–5 drinks and still inflict damage on all of them equally?
Midnight Tears (Ingested). A creature that ingests this poison suffers no effect until the stroke of midnight. If the poison has not been neutralized before then, the creature must succeed on a DC 17 Constitution saving throw, taking 31 (9d6) poison damage on a failed save, or half as much damage on a successful one.