Recipe for dogs with oxylate stones

My dog was diagnosed with oxylate stones. That is my vets educated guess as the stone was not removed and tested. He had a urinary blockage and the vet was able to push the stone back up into his bladder. He wants him on a Royal Canine So. It is very expensive. I would like to mix that with one of his two daily meals with a homemade meal. I need recipes and also some ideas for treats. I saw the chicken jerkey recipe. Any ideas would be greatly appreciated.