Great to hear the update! And I you should certainly not feel bad about adopting an "easily adoptable" cat. Like you said, he has been a heavy (though of course completely worthy!) financial burden and other adopters may not have been willing or able to do what you have done for him. I think he found the perfect home!
Sorry to hear about the digestive issues. I have heard good things about the brand Weruva, but my cats will not eat it. Picky picky.
@Sibley I had to tag you after talking about how our babies love the sink/shower drizzle. I bought an AquaPurr fountain for their Christmas present. It has been worth every penny!! They love it and drink a ton of water. I bought it directly from the Aquapurr website (the owner/inventor, Steve was SUPER helpful and responsive). It's available on Amazon, too. Best to google it and see it in action, but the gist is, it mimics the dripping/running faucet, but only comes on when the cats are beside it. My 2 girls know exactly how it works and constantly turn it on for themselves. And we're no longer wasting water by forgetting to turn the faucet off!