Refrigerate cat poop, so that the vet can extract useful scientific data from it, by the time it finally arrives at the vet's office and is more than twelve hours old.
Yes, I did it.
It was double-bagged.
(Zoe is still at the veterinary hospital; no more vomiting or diarrhea, which is good. They are schtuffing her full of fluids. And no visible obstructions showed up on any ultrasounds at all, which is a very good thing. She just has some swollen lymph nodes, they said. Hopefully, we get to pick her up tomorrow night, if they ever figure out what's wrong. =)