"Well, if you know the man I can suggest no greater guide for the jungle. As to what you need... well if you know the jungle it can provide a great deal of good food and water, but if you are not careful many of the plants are poisonous, even lethal. Some animals too carry venom in their fangs, spit, or skin.
"I have some good compact traveling food here, quite light yet good enough for a meal. If you have Ranuil with you, however, he can point out safe food and water. But it never hurts to be prepared. It rains every day in the jungle, so finding water shouldn't be too hard, but I'd keep a waterskin full just in case.
"As for hazards... watch out for poisonous snakes, assassin vines and other mobile plants, flying snakes, bats, and above all don't offend the tribes. The wild dwarves in particular don't forget a slight. And the taxabi and grippli, the cat people and frog people, don't offend them.
"Also I'd beware of the large insects, and the apes too. If you stick to the trails you won't have as much of a problem with the tribes, but you might get the occasional raid. If you go off the trails you'll have more problems with the animals and the taxabi and grippli. And a bit more explaining to do to any other tribes that find you on their hunting grounds. I'd bring presents if you intend to go off exploring. Iron goods are especially prized, as are metal jewelry or particularly fine weavings.
"If you are going to go off into the jungle you'll want a climbing kit or two, grappling hooks, rope, antitoxin, mosquito netting, tents, insect repellent, extra food, healer's kits, a compass, raincapes, some waterproofing salve... do you have any of that already?" Obar says thoughtfully.