Drink! Drink! Drink!

You cup your hands and taste the water. It's cold. After a climb like that, it's the greatest thing you've ever tasted! You guzzle down more until your thirst is quenched. After that, you rest for a bit on the benches before your inevitable trek back down.

When you stand again, you don't feel so good. After a few steps, you feel really bad. Was there something in that water? Oh no. You don't last long before the cave-dwelling ultra-dysentery causes all your organs to liquefy. You die!