Our 16 y/o kitty is in stage 2 kidney failure as well, diagnosed this June.
Someone asked about signs, and we noticed her peeing outside the litterbox and the vet did a bunch of tests that led to the CRF (chronic renal failure) diagnosis. Other signs she had that we know are CRF signs now are that she drinks a great deal of water and her litterbox "clumps" are about the size of baseballs.
The felinecrf.org site has been invaluable to us, as it goes into the symptoms, what to expect, and treatment options.
Our Sammy won't eat the prescription food, so we are continuing her on our vet-approved wet diet of Wellness foods. She also gets medication every day, Benazapril (we get it in a transdermal applicator; rubbing it on her ear is so much easier than giving a pill). The Benazapril is an ACE inhibitor, but it somehow works to shore up the kidneys. It seems to be helping Sammy.
We took up all of our area rugs and have shut her out of most of the house with baby gates to protect the wall-to-wall carpet from accidents. Most days she seems OK, but there are days when she acts sick, but thankfully those are still few and far between.
Best of luck to you and your kitty! *hugs*