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As thingstodo has mentioned, you should probably be consulting a nutritionist for this as well.
One thing that occurred to me is to look into the diets of mountaineers and perhaps artic/antartic trekkers. They need tonnes of calories with minimal weight as well.
One thing you could look into is dehydrated/freeze dried foods. It'll save you from carrying in all that water weight. Basically, you should look into food used by people where weight is a concern, such as space exploration and mountaineers.....
Then all you need is a steady supply of clean water. There's all sorts of nasty tropical diseases you can pick up from drinking contaminated water... .
How are you planning to make fire/cook etc?
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