Ideally this will be done first thing in the morning, if that doesn't work with your schedule you may do this whenever time permits.
Ideally this will be your first piss of the day, you will piss into the cup while sitting on the toilet, if you do not fill the cup to the top mark the level with the sharpie, mark sure plenty of it goes into the toilet as well, do not flush it yet,do not wipe when you are finished then take a mouthful of your own hot piss from the cup, you are not to spit or swallow a single drop of it.
Now put in a butt plug or if you don't have one the largest dildo you can fit up your ass. Once in place rub some icy hot on your asshole. Now slap each tit 5 times and put on the nipple clamps as tight as you can stand them.
Set the timer for twenty minutes, you will then lean forward placing your face in the toilet seat because thats where filth goes and have the lid lowered onto your head holding your face in the toilet. You must remain there still holding the water in your mouth for twenty minutes during which time you are to edge at least twenty times but may not cum. To successfully complete this dare you must edge at least twenty times before the timer goes off without cumming and you are not to swallow or spit out any of your mouthful. When the timer runs out take your head out of the toilet and spit the piss back into the cup, it had better reach the line you marked on it before, if it doesn't you must tell me as it means you swallowed some.
If you have successfully completed the dare you may now put a dollop of icy hot on your finger and finger yourself till you cum, you are to flush the toilet as you are cumming. I expect you to hold your mouthful until you have finished cumming as many times as youd like, you only need to flush as the first orgasm happens. Once you are done cumming you may take your head out of the toilet seat, take a comfortable position and swallow what is in your mouth, congratulations on being so willing to degrade your self for the pleasure of others.
Should you not edge at least twenty times or should you cum before the timer goes off or lose track of how many times you edged or you swallow or spit any of your mouthful out before you've fully completed the dare there will be a punishment.
Addendum: after measuring the piss in the cup to make sure it’s all there put it back in your mouth and hold it till instructed otherwise in the dare