When faced with a situation of survival (survival), clean drinking water is often the most important consideration. Humans can survive without food for weeks or even months, without water, but when humans can only survive for 1 days.
In addition to air, water is the most important nutrient for the human body. To maintain the health and efficiency of the body in an ideal environment, humans need minimum 2 liters of clean water per day. But in an environment that is very hot, very cold or very dry, two liters of water may not be enough to sustain life for several days.
Then what if the environment is very cold?
When the environment is very cold then the most threatening health risks is hypothermia. Hypothermia is a physical condition that occurs when body temperature drops below normal temperature (37 degrees Celsius) to 35 degrees Celsius or colder.
Hypothermia affects the body's core, such as brain, heart, lungs and other vital organs. Cases of mild hypothermia can cause people to experience physical and mental impairment, while severe hypothermia can lead to unconsciousness and even death.
Parents, people who under the influence of alcohol and drugs, as well as children and people with certain health problems are very susceptible to hypothermia.
People who love nature activities such as boating, swimming, fishing, hiking or skiing, and even that crashed in the mountains and water are also susceptible to hypothermia, but these conditions depends on various factors such as personality, behavior, physical condition, clothing, and environmental factors . Every person reacts differently to cold, even when you are in the same condition.
Generally, children lose body heat faster than adults and the thin body loses heat faster than overweight people.
Compared to cold air, water faster trigger hypothermia. Water removes body heat 25 times faster than cold air.
There are no data showing how long people can survive in cold conditions, but there are data that show how long people can survive in the water until eventually suffered hypothermia and died.