According to Healthline, people should consume around 2 liters a day. A 10-mile day hike, however, is another story. Variables such as terrain, weather, and speed determine how much YOU need to drink. Possibly much more than 2 liters.
If you’re carrying a heavy load or tackling a trail above 2,500 m, you should therefore be prepared to bring an extra few hundred ml of water per hour of hiking. For hiking, you need something that is made from more durable material so that it won’t break if it falls down and loses all your water. Peeing on a hike is normal, and you shouldn’t be ashamed to ask your friends to let you take a bio break on a hike. Lifestraw is passionate about clean, safe drinking water and promises that with every straw sold, a child in need will receive clean and safe drinking water for an entire school year
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If you hike, camp, and travel a long way for days on end, you won’t be able to carry enough water because it’s simply too heavy and impossible to carry. I won’t presume to prescribe anything to others, but what has always worked well for me on the trail is to occasionally supplement normal water with an electrolyte replacement drink (currently powered by Vitalyte) mixed with a little coconut water and sometimes some “natural sugar.” It’s a good idea to talk to a local guide, hiking group, or experienced hiker to get an idea of how much it takes most people to hike the trail you’re looking at. According to the US Center for Disease Control, bringing water to a boil for 1 minute kills all pathogens
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If you can use natural sources while hiking, you can increase the distance you can hike, improve your confidence, and improve your hiking skills. It is quite difficult for hikers with normal kidney function to both hike at a reasonable speed and to drink too much liquid. One of the most effective ways to calculate how long a hike will take is to use the Naismith Rule, which recommends setting aside one hour for every three miles of hike plus an additional hour for every 600 m climb. Those who spend many days outside also know what to do (and bring water filters if the trail has water)
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Some shorter hikes may lack kilometers, but due to their steepness, the variability of the terrain and the altitude at which they take place, they can require far more effort and take more time than longer hikes on more moderate trails or at lower altitudes.