Originally Posted by David Miller
Eliminate regular food. Bring some Ensure or Instant breakfast. With no kitchen and no food in the coolers you can drink all day every day.
I'd add that if you get some Depends
you should be able to maximize your drinking time even more.
Then again, you may want to take some memories home that aren't merely on your digital camera... Maybe consider going for quality instead of quantity?
Mind Phillip's caution against dehydration - you'll be chilling on the river and then hike 50 feet up from the bank and feel like you're in a blast furnace. Bringing lots of lemons and limes along helps to flavor those gallon jugs of water you should be pounding in the heat until late afternoon (and will also prevent scurvy).
Have a great trip!