“How much water will you need for the day?” the guide asked as we prepared for our second day of trekking through the Andes.
“I don’t know, a liter?” answered one of our group members. I gave the guide a skeptical look, that number seemed dangerously low to me. Our plan for the day included ~4700 ft of elevation gain through an exposed section of high altitude desert with no shade and the forecast was predicting temperatures over 90°F. Both my experience and the research I’ve done on water requirements for hikers suggested that 1L wouldn’t be anywhere near enough: