Sorry for the late response. But I've finally come up with something that seems perfect.
It's a mix of both a challenge and a bathroom schedule. Ideally, get up an hour before you start the schedule. But don't pee when you first get up. Get ready for the day before you can even pee.
7am: Drink 16oz of water before going pee and emptying your bladder completely.
9:30am: No peeing but drink 16oz of water and press on you bladder for 2 minutes.
12pm: Spend 5 minutes relaxing and contacting your pelvic floor. Whatever you do: no leaking. Drink 8oz of water.
12:30pm: Empty your bladder completely. Drink 32oz of water and massage your empty bladder.
1pm: Drink another 16oz of water. Then spend 3 minutes relaxing and contracting you bladder. Again, no leaking.
4pm: Massage your bladder and lean against a counter and It feels like you're about to lose control. Sit on the toilet but don't pee.
5:30pm: Drink 32oz of water. Sit on the toilet again. This time, leave your underwear on. Don't pee.
7pm: Drink 16oz of water. Contract and relax your pelvic floor muscles for 2 minutes.
7:30pm: Relax entirely as if you are allowing yourself to pee. Wait until the last possible moment to contract your muscles again. Do this 5 times.
8:30pm: Relax entirely and wait until the last possible moment to contract your bladder muscles for five minutes. Drink 8oz of water.
9pm: Drink 8oz of water by taking as small of sips of water as possible. Press on your bladder for 30 seconds as hard as you can. Only then are you allowed to empty your bladder completely.
If you want to add an additional challenge, go to bed with a full bladder and you're not allow to pee until the next morning.
If you at any point leak or fail to hold until the scheduled time, drink double the amount of a diuretic to replace what you lost.
Congrats! You've finished. Let me know how it goes. I'd love to hear it!