As the time approaches, this is the slut's given punishment, with the revisions she has requested to fit in with her schedule and the rules given to her by her Master.
Four hours before your punishment begins you may use the bathroom. After this point you do not again. However you will drink a minimum if 2 pints of water in the first hour, minimum of three pints in the second hour, and a minimum of 4 pints in the third hour, )being zero hour. . You will also fill a 2l bottle with water and place it in the fridge at this point so it is chilled by zero-hour.
When the punishment begins, you take your water and go to the bathroom. Put the stopper in your bathtub, place a cushion on the rim of the bath, we do not want to damage you. Strip to your panties, ideally white cotton, you shall wear nothing else.
Lay in the tub, your back in the bath, your arse on the rim on the cushion I have permitted. Bring yourself to the edge of climax in this position, hold the edge for a minimum of five minutes. At the end of this time you are to empty your bladder in this position, wetting your panties and covering yourself in piss.
When you have pissed, you will bring yourself to the edge again, this time in your own piss soaked panties. Next, remaining in the bath full of piss, you will drink the bottle of water provided. Every ten minutes you will bring yourself back to the edge, holding for two minutes. If you require to piss again, you will do so exactly as before, arse high, and masturbating before your piss has time to cool. This continues until both your bladder and the water bottle are empty. When done, you will remove your piss soaked panties and wear them on your head. Lay on your front in the bathtub and spend ten minutes masturbating furiously. At the end of the ten minutes you may clean up, punishment over.
***********************
Perhaps I should give instructions on the making of a home-made funnel gag to wear through the task.