You may return to your normal diet immediately upon discharge from surgery. However, adhering to foods such as rice, soups, noodles and avoiding high fiber meals and vegetables like celery is advised as your intestines may take up to a week to recover from the surgery and anesthesia.
Because of the raw surface in your bladder and urethra, alcohol, spicy foods and drinks with caffeine may cause some irritation or sense of the need to void despite the fact that the catheter is emptying the bladder. If these foods don't bother you, however, there is no reason to avoid them in moderation. More importantly is to keep your urine flowing freely and to drink plenty of fluids during the day (8-10 glasses). The type of fluids (except alcohol) is not as important as the amount. Water is best, but juices, coffee, tea, soda are all acceptable.