Welcome, @drs460mayo. It sounds like your recurrence is non-invasive and non-muscle-invasive, which are typically treated the same as early stage bladder cancer. You can read more in this article:
- Bladder cancer: What you should know about diagnosis, treatment and recurrence https://cancerblog.mayoclinic.org/2023/05/30/bladder-cancer-what-you-should-know-about-diagnosis-treatment-and-recurrence

You might be interested in this related discussion:
- Bladder cancer recurrance: What are the treatment options?
https://connect.mayoclinic.org/discussion/bladder-cancer-recurrance/
However, I believe you're asking what dietary or lifestyle changes can you make to reduce the risk of recurrence. Have you considered consulting an oncology registered dietitian?