The basic jungle tool is the machete, with Tramontina the major South American producer. Next would be water purification; chemical and a mechanical unit. Malaria and other insect born illness' require insect reppellent and netting. Food is plentifull IF you know what is edible, which brings us to the native peoples with their intimate knowledge. My friends who travel the Amazon say Magnesium firemakers are highly esteemed as gifts and virtually a unit of barter. A conquistador was lost in the jungle. After several weeks he resolved to commit suicide by ingesting a known poisonous root. Boiling it into a porridge he discovered it was now safe to eat and nutritous and was able to return safely. It is a dish we call Tapioca. the locals could have told him that, but he carried a sword and not magnesium fire bars ;O)