I am running the full race tomorrow having run the last two years as relays, and the full race on the previous two years. It is a really hard race and the constant climbs and descents really take it out of me, and I expect it to be particularly moist tomorrow. My advice would be to take it easy until the second checkpoint at least then race from there if you still have anything in the tank, The first time I ran the full distance I treated it like a normal marathon, and the last third was agony. The second time I took it easier, really enjoyed it and felt great over the last third overtaking loads of runners. My mate who was running it for the first time after beating me by a minute over a road marathon a few weeks earlier left me for dead after the first checkpoint, then came in 25 minutes after me swearing he would never do it again. He is running again tomorrow.
As others have said there are only three water stops with nothing but water so taking energy gels and drinks with you would be a good idea. Final piece of advice do not drink a pint of scrumpy the moment after you pass the finish line. It was not a good idea.