Hi Marie!
I really applaud your efforts to do the best healthiest things you can for your cat Vavavou (love the name!).
If you are looking for an alternative to conventional methodologies I highly recommend seeing a holistic/integrative veterinarian. They can bring everything together in terms of a balanced treatment. I went online and found, at the website for the College of Integrative Veterinary Therapies:
www.animomedicveterinaire.com .
Of course Dr. Pitcairn's book is an excellent resource! Remember, when making cat food recipes, that with kidney failure, cats are having trouble dealing with protein.
Anyway, hope this helps.