This is could be a little off-topic, but maybe your cat has still some months to live, so please read my story :)

We've been there two years ago. The cat was on a renal veterinary food already, but suddenly began to eat less. We did the blood test and as our vet suspected it was due to the rising levels of creatinine which is the symptom of the kidneys problems. With high levels of creatinine, besides other problems cat stops to eat.

You can lower the level using the right food, then the pills and finally the most powerful solution is giving the cat saline infusions, so to "wash out" the creatinine from the blood. Direct infusions into the veins works best, but if your are not a vet, at home you can give the cat underskin saline infusions.

Consult your vet about this. We had prolonged the life of our cat for something like 1,5 year - he started eating more, he felt good - but we had to do the infusions every two days.

One day even the infusions stopped working, cat refused to eat, walk... and we had to put him down. But since you cat still feels quite ok - fight for it :) Good luck!