This is one of the great myths of survival, widely relayed by guys like Bear Grylls on TV, but it is above all bad advice
Rationne your water
This is probably the biggest mistake you can make in survival. In a hostile environment, dehydration is very fast, and the real good rule is to drink when you are thirsty
If you are bitten by a snake, you must know which species has bitten you
Suck a snake bite to suck out the venom
If you are stranded on a desert island, run away
If you get lost in the forest, go get help
In the desert, you can drink the water of the cactus
Moss always grows on the north side of trees
Don't be afraid of bears, just face them, raise your arms and make noise