Yes. You can tale a shower after the PRK surgery. But you must do something to protect your eyes from getting wet. Also, you shall avoid doing some excises that need excessive exposure of water to the eyes such as swimming. To help you recover from PRK surgery quickly, you shall also avoid smoke, dust, and other irritants to the eye. Hope this can help you.
You may, but you really need to be very very careful. Don' t let even a drop of water fall on your eyes. You should know some stuff after your prk surgery. You are not allowed to rub your eyes for the first ten days. Of course you can' t even drive for at least one week. Besides, you have to wear sunglasses all the time to protect your eyes after that surgery. Oh, right, do not drink or smoke at all, which will irritate your eyes. No makeup, swimming, showering, working and so on. Your eyes are quite fragile at that time, you do need to pay more attention to those information that I offer you. Good luck to you, may you recover soon.