You could always add a couple of boxes of Pringles, a few cans of Cashews, Almonds, Pecans nuts etc. some # 10 Mountain House Cans' (gives around 4800 Calories)

and some cans of Slimfast (packed with calories and added vitamins)

http://www.amazon.com/Slim-Fast-Optima-V...ref=gronf_njs_1

and some dried milk powder for the Slimfast milk shakes and breakfast cereals.

Plus a box of Scotts Porage Oats Original

http://www.englishteastore.com/scpooa11lbs.html

and a couple Heinz Puddings

http://www.englishteastore.com/cak004.html

and some Earl Grey Tea of course;

http://www.englishteastore.com/dobeeagrtea2.html

Add some bags of rice, dried mushrooms, dried onion or sage and onion stuffing, dried potato, peanut butter, canned beef and canned Ghee or Butter etc

For 7 Days you will need a around 20-25,000 calories and even with high energy density food i.e a high fat content typically this would mean carrying around 5-6kg or 12-14lbs of food by weight. A few mainstay rations and MREs aren't going to sustain you for 7 days and better tasting more nutrious food can be found at the local supermarket.

Look out for long shelf life food packaging at the supermarket such as the same aluminized plastic retort laminated packaging used in Military rations i.e. Tuna and Salmon etc and the lighter weight aluminium cans.