ploddinTod

Ed,
For a bread course, I'd pack bagels (they don't mash as easily as sliced bread) and/or flour tortillas. You can put anything on a tortilla--ham/cheese, tuna, scrambled eggs with potatoes, etc.
As for water, I believe there is a major stream running through the park and maybe some minor ones too. If you have a filter, of course, you don't have to worry about hauling all your water for the entire trip. Another option is to purify it with iodine tabs. Even Walmart sells them--Aqua Pure or something like that. You'll have that iodine taste after treatment but you can mask that by adding Tang, Crystal Lite or some such.
When you go to scoop water from the creek into your bottle, cover the mouth of the bottle with a bandanna, handkerchief or even a coffee filter to keep the floaties out.
The only critter I believe you have to worry about is the marauding raccoon. Bring a rope and string it between two trees and hang your food bag midway between the trees. Urinate around the base of both trees to mark your territory.
Hope this helps.

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PloddinTod