Without qualified medical personnel available, it is you who must know what to do to stay alive. To survive, you need water and food. You must also have and apply high personal hygiene standards. Other factors, such as heat exposure, cold exposure, intense activity, high altitude, burns, or illness, can cause your body to lose more water. You must replace this water.
Dehydration results from inadequate replacement of lost body fluids.
It decreases your efficiency and, if injured, increases your susceptibility to severe shock. A 10 percent loss results in dizziness, headache, inability to walk, and a tingling sensation in the limbs. A 15 percent loss results in dim vision, painful urination, swollen tongue, deafness, and a numb feeling in the skin. A loss greater than 15 percent of body fluids may result in death. Low urine output.