Thanks for the reply im devastated and trying my best, im mostly afraid for my other cat they share everything up until the last two days I will clean the house but i feel bad keeping my FIP kitty in a room aloneWelcome to TCS! I'm terribly sorry your cat was diagnosed with FIP. We also had a very young cat awhile back who had the disease so I can appreciate and empathize what you're going through. I thought this thread might help answer your question:
Cleaning up after FIP
I'm sure other members will come along to share their experience with FIP in a multi-cat household.