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The objective is to have a full bladder during the radiation treatment and it should be the same fullness as when they are doing the pre-treatment scan. I would just have my morning coffee about 45 minutes before treatment, drink a bit of water on the way and I was guaranteed to have a full bladder but not painfully full. Ask your doctor if you can reduce your water drinking but you will make sure you have a full bladder for the treatment and he will probably say that that is fine.
The foods were not actually banned (at least where I got radiated) but are listed as foods to eliminate if you are having problems. Coffee may even protect against some radiation damage as suggested in some papers but that really hasn't been proven.