Don't travel at night as visibility is low. Don't drink unboiled or stagnant water. If you have to, look for a moving stream with clear running water. Don't eat any fruits or plants unless you know they are edible. Don't leave camp without informing others. Don't stray away from other trekkers. Safety in numbers. Stay healthy. Don't take unnecessary risks like climbing rocks and trees. Important items that a trekker must possess - a large knife and waterproof matches or lighter. Check with your guide or expedition leader whether it is safe to swim in the river. Rivers may look safe but if there are heavy rain up stream, the river water level may swell in a very short time and can sweep away even a very strong swimmer.
tips if you get lost
If you are lost, back track and check your bearings before continuing. Stay put because it would be easier for the rescue teams to locate you than if you were to wander around aimlessly. Listen to the sounds of water, either stream of river. Follow it downstream until it leads you back to civilisation. Always think of self-preservation and never take unnecessary risks. Try to leave some sort of mark along your path by systematically slashing leaves or tree barks so that you can find your way back if necessary. Don't run because you may trip up and hurt yourself.