I went to [Amazonia Expeditions][1] in Iquitos and they assigned a local guide Manuel who is born in a village near their [Tahuayo lodge][2]. 

He took me to the upper white river by a boat, which native locals use, into the jungle camping for 3 days. He only brought a water with us (he and his boat driver drink the water from the river but not for me) and all the foods we had were by fishing or digging plants.

His grand father lead a group of people and settles there and opened up the village and his father was also a guide helping the researchers in the jungle. He told that the navigation he uses was remembering the shapes of trees or paths and their locations, like a photographic memory creating mental maps. Without compass or GPS, the native locals can walk around in the jungle without getting lost. He said not everyone had such navigation skills which made them good guides.

Amazonia Expedition can find a guide like Manuel.

  [1]: https://perujungle.com/
  [2]: https://perujungle.com/maps/