Not only should you knock the Pepsi out of your repertoire, you should remove all caffeine for the time being. The urge to pee has a lot to do with hormones (ADH/vasopressin and aldosterone). Changes in the way these hormones are secreted can affect the way you pee (frequency and volume). I'd just wait it out, drink water and see how that goes. I'd also make sure to eat foods rich in calcium. The way aldosterone works, if you're peeing a lot, you might also be flushing out a lot of Ca.
Do you think it could be nerves/stress? I find that when i'm stressed out or nervous/scared about something, i tend to pee more.
As for the water thing ... I was kinda forced into trying it too, this summer. Since i've been working this summer, i've been drinking a lot of it, as we're only allowed to have water w/ us while we're working. I can hold it for a good 3hrs now, which i've never really been able to do before.
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