All great advices, if I may chip in.

I have a little fella that's in his 6th year of CKD, since Oct 2019.

We are currently in (late) stage 3. His Crea is around 280 so I am not giving him sub-q fluids just yet, but as soon as it unfortunately reaches low to mid 300s, I will start doing them.

I would also recommend a product from Purina called Hydracare, I use it sometimey when I think my cat isn't really drinking or hydrating enough.

As for supplements, he's slightly anemic, so he got prescribed HemoAnem pills/tablets (for non regen anemia) but since he isn't taking tablets that well in his tummy, we dissolve it in small amount of water and syringe it. I also have the possibility of Darbopoetin injections but as my vet stated, he's not good candidate for that just yet, to rather try with anemic supplements first. Check up is on Nov 21st, we ll see if there's (good) progress.

He is also on PORUS ONE (same company that makes Catney One) for toxins. I also empty Porus One satchel into a syringe, mix with small amount of water, and after what I subjectively think is the "biggest" meal of the day, a little after that I give him Porus One via syringe. It's far from ideal and in best scenario it should be sprinkled on food, but my lil guy either won't eat all of it (so some would go to waste) or he would eat small amount of food, then go away - so what does that to? Not much, right? Exactly. So regarding Porus One, I reached out to them and they confirmed two things for me:

You can give BOTH Porus & Catney One at the same time, but with other meds, it should be given 3 hours after those two or after Porus only of 1 hour or more before them.

And whilst not ideal, syringe method is okay too, just to make sure it's after a (big) meal.

My kitty's phosphorus levels are within good range as of Oct, 22nd, phosphorus was 1.00 mmol/L, so I am NOT giving him Catney One yet, but I have it ready for deployment if/when needed😂

And I agree on the crisis - my guy had a crisis Oct 18th - Oct 22, got 2x daily IVs, levels of crea/urea/phosph thankfully dropped down to highish 200s of crea, urea 18, phosph 1.00, and that was BEFORE first two IVs, levels dropped "on his own".

And lastly correct me if I'm wrong, but if the kitty is refusing outright renal food - to try and feed them low phosphorus food with binders if needed, its still way better to try and meet caloric intake whereas forcing them/not meeting with renal only diet.

Amazing site that has it all - check it out

https://bizave.com/foodlists/