We ran into a hiker earlier this year who was trialling hiking without a stove and relying only on food that didnt need to be cooked. His main meals consisted of muesli, dehydrated milk, dried apples and custard. (This led to us nicknaming him 'apples and custard' which he seemed to like, strangely).
He managed a 5 day hike with this menu and did admit that was a little monotonous but can proved it be done!