I had 2 years as an intantryman in Panama in the early eighties. The jungle can actually be a fun place. There are a few things that you would need. Clothing that is fast drying, a hammock to sleep in ( too many critters on the ground), a poncho to keep dry, a machete, a swiss army Knife or multitool and the ability to start a fire in the rain. You would also need a map & compass and 1st aid kit and the ability to use them well. People that are claustrophobic, fear the darkness or lonliness may have a hard time. You would also need to purify water.