Advice for sleep deprivation?

I have not slept for pretty much 2 nights. It is extremely important that I not sleep again tonight and get something done by 8:30 AM tomorrow. I know it isn't optimally healthy, but after that I can sleep all I want. I'm so tired though and afraid I will inadvertently fall asleep. I need ways to stay awake and I have already had 2 L of diet pepsi max (spread over the past couple of hours) and a coffee.