I will preface my comments by saying that a healthy diet, especially one that uses moderation in all areas, is what we should ALL be on no matter whether we have been diagnosed with cancer of any kind or not.
However, radically changing your diet upon diagnosis will not change the diagnosis nor have much influence on what happens next. IF your diet was truly awful and was somehow a part of the cause of your cancer, you would have needed to change it 20-30 years ago. Whatever changes started to occur in your bladder lining have been going on for a long long time before they became large enough changes to result in diagnosis.
Oncovite, a high quality multivitamin MARKETED by Dr. Lamm, and the very similar Bladder 2.2 sponsored by a group of urologists, are supposed to contain vitamins that might promote healthy bladder tissue. They ARE expensive, but not harmful in any way. If you maintain a healthy life style and diet, they probably are not necessary. I liken them to Ocuvite, which the ophthalmologists promote for healthy eyes. Definitely not miracle drugs....just a very high quality and expensive multivitamin.
There are things that you can do, besides maintaining a healthy life style if you haven't already....QUITTING SMOKING is the number 1. Maintaining your fluid intake and getting exercise are some others.
To my knowledge, no one has proven scientifically that any of the other things on your list REALLY have any effect on cancer.
Sara Anne