@fcampo1957, I want to weclome you to Connect, and I commend you for looking for informtion about how you can learn to maintain a healthy diet for your kidney health.
I am probably an unlikely person to respond because I experienced acute (sudden) kidney failure and skipped the stages. I also had to be on dialysis until my transplant for a liver and kidney, and so everything that I drank or ingested was under the direction of a specialized nutritionist. However, be assured that I can understand your confusion and concern. And so I am sharing the following information:

The National Kidney Foundation has a website that will provide you with reliable/accurate information about our kidneys health, kidney disease and risk factors. If you scroll to the bottom half of the page, you will find - Diet and Nutrition. I like this site because it gives you ideas for adjusting your own favorite recipes.
- National Kidney Foundation
https://www.kidney.org/kidney-basics
How long have you known that you were Stage 3? Do you like to do your own cooking?