The race is actually longer this year and will NOT be under three hours for most. Winners in the 3,4, and 5 fields will be around 3:10-3:15. Keep in mind...that is the winner. Some will be out there for an additional hour. Everyone has different personal hydration needs so you should experiment in training to understand how much you will need.
The first feed zone is really early at mile 22. Many racers go through that feed realizing they haven't taken a sip of fluid yet. :hmmm: I think that feed is useless unless you start with only one bottle. OTOH, this feed could be a godsend if you lose/drop a bottle early in the race.
The next feed zone is at mile 44. A little late in the race. By the time you get a feed there and drink it, your race has been decided. Try to make up for missed hydration and you will go up Stage Rd. all bloated.
In 2012, ToB volunteers offered neutral feeds of water but it was very sporadic. They were volunteers and not the most dependable. I was in the feed zones providing for clients after my race. I heard plenty of riders enter the feed zone asking for "neutral water". Most left empty-handed. If you go through the feed off the back and alone, you have a good chance of getting a neutral feed. Go through in a pack of 50 riders and you are in a dream world.
If you do not or can not make arrangements for a feed, you can carry a third bottle from the start. I have done that for two years. I drink one from my bike in the first hour. Dump the empty. Then replace it with the bottle in my pocket. If I lost a bottle along the way, which is very common on these rough roads, I would go through the feed asking for a neutral.
I find a bottle in the pocket to be really friggin annoying so it provides a reminder to drink.