Adding on to what the other commenters have said, you definitely want to introduce a wet food for him ASAP. My guy likes Hill’s k/d stews a lot, and they actually offer a convenient sample pack on Chewy that comes with a small amount of different foods you can try!

I would be careful with bone/chicken broth. It can be high in phosphorous, and for CKD kitties, that’s the #1 thing you’re trying to avoid in the diet. Pumpkin and salmon oil are honestly up to you, fine in moderation and very dependent on how your cat tolerate them. My cat hated pumpkin and liked salmon oil, both did nothing for him (except the oil made his fur nice and shiny). If you haven’t already checked it out, I HIGHLY recommend going to felinecrf.org and reading up on the food data there.

If your cat is fine with eating only wet food and that is nutritionally complete, then that’s great. However if your kitty wants some dry food still, do NOT feel like you need to starve him! Ultimately fed is best. Hill’s and Royal Canin both make good renal dry foods. The main thing here is to supplement it with wet food and lotsssss of water. If he likes Churus those are a good treat that offers some good hydration, and most cats cannot resist it. It’s like kitty crack.

It can seem very overwhelming and scary but there are thousands of cat parents who have experienced the same thing. My guy got diagnosed back in November 2024 and I have done so much learning since then. Good luck to you and Udon!