And poor you, too, Kirsten - the only thing worse than cleaning up kitty vomit is watching the poor things go through it. When Grasshopper was vomiting, I thought, like you, it was hair. However, the presence of so much liquid was not typical of tossing a hairball, at least not for her. They did do a blood panel, which is why she is now on anitbiotics. If she's hanging in there and you can wait to go to your regular vet, you might request they check for infection. My vet also put her on small doses of Pepcid, an antacid med available over the counter here for humans. That has done her a lot of good. Perhaps along with diet changes there might be some supplement you can give her to maintain a healthier stool.
I'll be thinking of you and praying all turns out well.
Headbonkies to Luna from grasshopper - Ko