I agree with what all the others have said; the sub-q's made a huge difference for Sammy, and the Pepcid helped her want to eat.

She ate renal diet for about 3 years after initial diagnosis, and then decided she didn't like it. Someone posted this link that gives protein, sodium, and phosphorous levels for other commercial foods and I found senior foods that she liked that weren't as far off a renal diet as some other foods:
http://webpages.charter.net/katkarma/canfood.htm
Hunt around for links from this site - they also have dry food ratings.

And, as the others have said, eating is more important than eating a specific diet.

I also used the felinecrf.org site that the others have mentioned.