Solid food, and he's pooped normally three times since Saturday night. He went from eating the solids in the canned food along with the Pedia-gravy, to eating canned food with kibble mixed in with just enough water to moisten the kibble, to eating plain moistened kibble. When I left for work, I left three bowls of dry kibble spaced around the kitchen. He started eating in the kitchen yesterday, but I still feed him in the bedroom sometimes when I need to monitor his food intake and make sure his sisters aren't competing with him.
Gabe was very skittish this morning, running from one place to another, avoiding the other cats, and backing off when I tried to pet him. Buttercup had been hissing at him soon after he awoke, and I don't know if that's what upset him. I sprayed some Feliway around the bedroom. I hope that helps him calm down; I haven't seen him act this way before.
FIP test results not back yet.