Field Sustainment: Hydration

This article comes to us by milsim player Scorpion1. Many thanks for his insight for his time in putting together this article. As always, all acronyms are defined on the Milsim Dictionary page under the Resources tab.

As a combat soldier you find yourself cut off and alone from time to time. No resupply, no reinforcements. At Eastwind you don’t have to worry about being alone or cut off for long. However there is the need for water. While a disciplined soldier can make 1 MRE last a week depending of environmental conditions, water is another matter.

Your body loses water through normal body processes (sweating, urinating, and defecating). During average daily exertion when the atmospheric temperature is 20 degrees Celsius (C) (68 degrees Fahrenheit), the average adult loses and therefore requires 2 to 3 liters of water daily. 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.

Consider the following results of body fluid loss:

  • A 5 percent loss of body fluids results in thirst, irritability, nausea, and weakness.
  • 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.

The most common signs and symptoms of dehydration are–

  • Dark urine with a very strong odor.
  • Low urine output.
  • Dark, sunken eyes.
  • Fatigue.
  • Emotional instability.
  • Loss of skin elasticity.
  • Delayed capillary refill in fingernail beds.
  • Trench line down center of tongue.
  • Thirst. Last on the list because you are already 2 percent dehydrated by the time you crave fluids.

You replace the water as you lose it. Trying to make up a deficit is difficult in a survival situation, and thirst is not a sign of how much water you need. Most people cannot comfortably drink more than 1 liter of water at a time. So, even when not thirsty, drink small amounts of water at regular intervals each hour to prevent dehydration. If you are under physical and mental stress or subject to severe conditions, increase your water intake. Drink enough liquids to maintain a urine output of at least 0.5 liter every 24 hours.
In any situation where food intake is low, drink 6 to 8 liters of water per day. In an extreme climate, especially an arid one, the average person can lose 2.5 to 3.5 liters of water per hour. In this type of climate, you should drink 14 to 30 liters of water per day.

With the loss of water there is also a loss of electrolytes (body salts). The average diet can usually keep up with these losses but in an extreme situation or illness, additional sources need to be provided. A mixture of 0.25 teaspoon of salt to 1 liter of water will provide a concentration that the body tissues can readily absorb. Of all the physical problems encountered in a survival situation, the loss of water is the most preventable.

The following are basic guidelines for the prevention of dehydration:

  • Always drink water when eating. Water is used and consumed as a part of the digestion process and can lead to dehydration.
  • Acclimatize. The body performs more efficiently in extreme conditions when acclimatized.
  • Conserve sweat not water. Limit sweat-producing activities but drink water.
  • Ration water. Until you find a suitable source, ration your water sensibly. A daily intake of 500 cubic centimeter (0.5 liter) of a sugar-water mixture (2 teaspoons per liter) will suffice to prevent severe dehydration for at least a week, provided you keep water losses to a minimum by limiting activity and heat gain or loss.

You can estimate fluid loss by several means. A standard field dressing holds about 0.25 liter (one-fourth canteen) of blood. A soaked T-shirt holds 0.5 to 0.75 liter. You can also use the pulse and breathing rate to estimate fluid loss.

Use the following as a guide:

  • With a 0.75 liter loss the wrist pulse rate will be under 100 beats per minute and the breathing rate 12 to 20 breaths per minute.
  • With a 0.75 to 1.5 liter loss the pulse rate will be 100 to 120 beats per minute and 20 to 30 breaths per minute.
  • With a 1.5 to 2 liter loss the pulse rate will be 120 to 140 beats per minute and 30 to 40 breaths per minute. Vital signs above these rates require more advanced care.

WATER PURIFICATION
Rainwater collected in clean containers or in plants is usually safe for drinking. However, purify water from lakes, ponds, swamps, springs, or streams, especially the water near human settlements or in the tropics. When possible, purify all water you got from vegetation or from the ground by using iodine or chlorine, or by boiling.

Purify water by–

  • Using water purification tablets. (Follow the directions provided.)
  • Placing 5 drops of 2 percent tincture of iodine in a canteen full of clear water. If the canteen is full of cloudy or cold water, use 10 drops. (Let the canteen of water stand for 30 minutes before drinking.)
  • Boiling water for 1 minute at sea level, adding 1 minute for each additional 300 meters above sea level, or boil for 10 minutes no matter where you are.

By drinking nonpotable water you may contract diseases or swallow organisms that can harm you. Examples of such diseases or organisms are–

  • Dysentery. Severe, prolonged diarrhea with bloody stools, fever, and weakness.
  • Cholera and typhoid. You may be susceptible to these diseases regardless of inoculations.
  • Flukes. Stagnant, polluted water–especially in tropical areas–often contains blood flukes. If you swallow flukes, they will bore into the bloodstream, live as parasites, and cause disease.
  • Leeches. If you swallow a leech, it can hook onto the throat passage or inside the nose. It will suck blood, create a wound, and move to another area. Each bleeding wound may become infected.

WATER FILTRATION DEVICES
If the water you find is also muddy, stagnant, and foul smelling, you can clear the water–

  • By placing it in a container and letting it stand for 12 hours.
  • By pouring it through a filtering system.

Note: These procedures only clear the water and make it more palatable. You will have to purify it.

Also, f you are gathering water from a stagnant or other murky water source it is often a good idea to cover the mouth of your gathering container with a sock or other cloth to keep as much gunk from being collected as possible.

To make a filtering system, place several centimeters or layers of filtering material such as sand, crushed rock, charcoal, or cloth in bamboo, a hollow log, or an article of clothing
(Figure 6-9).

Remove the odor from water by adding charcoal from your fire. Let the water stand for 45 minutes before drinking it.

I hope this helps when you are out on those long days and nights and run out of water.