Sounds like a grand adventure, Amy. Phred has some good advice - gosh, I've never thought about a whistle or filing a plan with the ranger - good tips! AND OF COURSE WE WOULD MISS YOU, YOU SILLY!
Not sure what to tell you about the foods - I know that we used to get products from Cell Tech (blue-green algae foods) that were designed for high-energy activities like mountain climbing, but they aren't carried in stores.. Maybe some health food stores might have some other foods containing blue-green algae. Be safe, have fun! You're on my prayer list! OH_ don't forget to add this to your list - "camera" !