i believe you would want 2liters of water per day and 24oz of food per day (on average). i may be mistaken. there are some backpacker sites out there devoted to trail nutrition. i do know this though, the more trail time you intend, the more caloric intake you want to prepare for. on the trail, calories are fuel! that and carbs.
if you have an REI or other outdoor store near you, you can find some pretty good freeze dried foods (relatively good anyway - at least when you are hungry and have been hiking all day!!). i would recommend the spaghetti, chilimac with beef, and enchiladas. also, the bagged tuna, ham and chicken sold at grocery stores are surpisingly good. the ham with some cheese on a bagel is really tasty in the morning. toast the bagel a little with some butter on it and warm up the ham to help melt the cheese a little - good stuff!! ramen noodles are good too. power bars and gels are good for trail snacks to give a good boost of energy - the gels are faster. stick with carbs and calories during the day, then plenty of protien for breakfast and dinner. i have found this to keep my muscles from getting as sore and fatigued. this, plenty of stretching and taking a tylenol before bed will keep me fairly lose, relaxed and pain free most of the time.
this is backpacker.com's tips and hints about trail food/nutrition. maybe you can find something there of importance.
http://www.backpacker.com/nutrition
this is one of my favorite sites, recommended reading!!
http://www.backpacking.net/index.html