I’m sorry to hear about your cat. 🫂
Just to add on about FIP treatment— if your cat ever gets FIP then on Facebook look for “FIP warriors” or “global fip cats” (iirc) to find volunteers who can help supply medicine
Also note that there IS an FDA approved compounded version but many vets aren’t aware about it, and even if they were aware since it is compounded they won’t have it in the office. This means that it will take a few days for you to order and treatment is often time sensitive from what I’ve heard.
FIP Warriors is who we went through, but it progressed too quickly because the fluid accumulation was in his lungs, not his abdomen.
That medication is quite new to the market and wasn’t available when this happened about 4 years ago, but I will mention this to our current vet so that she knows about it.