1 pm - 2 pm
You should have lunch this hour, so drink juice instead of water this hour. 500 ml of it!
The game this hour is to go in your panties/boxers (you might want to use a clean pair) 4 times this hour. What's the catch? Put your secondary glass or mug under it to catch any stray spurts. Whatever goes through, you have to drink. Oh, and you can't put your other clothes back on either.
If you don't want to drink your own pee, or think this idea is more fun: instead of putting a glass under there, you can also put your shirt under there. Put it back on in between pees.
After your third pee, put your underwear in your mouth and suck on it for a minute or so. If you don't want to do that, drink another 250 ml of water.