Some kind of power bar or long term food. Here are a few links.

http://beprepared.com/product.asp_Q_pn_E_FM%20R360_A_name_E_MAINSTAY%E2%84%A2%203,600%20Calorie%20Food%20Bar

http://www.maydayindustries.com/mayday_food.html

https://beprepared.com/product.asp_Q_pn_E_FM%20R400_A_name_E_FM%20R400

These are just links to the products that you might want to look at for him and or yourself.

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