Water Collection Techniques

If you're stranded and there isn't a fresh water source around, then you need to get to work on collecting water. There are a few techniques to do this, and it doesn't hurt to set up more than one system. The more water you can collect, the better your chances of survival.

One pretty basic way you can collect water is to make a belowground still. To do this, you'll need some plastic sheeting, a digging tool, a container, a drinking tube and a rock.

  • Choose a moist area that gets sunlight for most of the day.
  • Dig a bowl-shaped hole about three feet across and two feet deep, with an additional sump dug in the center.
  • The sump should be flat and big enough to hold your container.
  • Place the container into the sump.
  • Put the drinking tube in the container and run it up and out of the main hole.
  • Place the plastic over the hole and cover the sides with rock and soil to keep it there.
  • Put your rock in the center of the sheet and let it hang down about 18 inches, directly over the container to form an inverted cone.
  • Add more soil on the edges for stability.

Solar still

The moisture from the ground reacts with the heat from the sun to produce condensation on the plastic. The still forces the condensation to run down the plastic and into your container. You can also add vegetation inside the hole to increase the amount of moisture -- just make sure the plants aren't poisonous. Use the tube to drink directly from the container. If you don't have one, you can remove the container and reassemble it after. A good still can produce up to one quart of drinking water per day.

For better-tasting water, let it sit for 12 hours if you can afford to. You can also make a filter to remove any visible particles:

  • Find a large can, hollow log or plastic bag. Hollow bamboo will also work.
  • Punch 5-10 small holes around the base of your container and suspend it from the ground.
  • Fill it with alternating layers of rock, sand and cloth.
  • Use both fine and coarse layers, the more the better.
  • Pour your collected water into the filter and catch it in another container below.

Homemade water filter.

The water should come through fairly clear, if not you can pour it through again. Add charcoal from your fire to remove odor -- just make sure you filter the charcoal out with some cloth. This method merely removes large sediment and improves the taste. You should always purify the water by boiling it.

In the next section, we'll look at some other techniques for collecting water.

More Water Collection Techniques

If your energy is low, you'll want to avoid the digging involved in a belowground still. All you really need is a clear plastic bag, and you can use the transpiration technique to collect potable water:

  • In the morning, take a bag and tie it around a leafy green tree branch or shrub.
  • Weight the inside with a rock to create a low point for the water to collect.

Transpiration bag.

Don't Drink the Water
Giardiasis isn't the name of a fine Italian wine. It's actually the most common waterborne disease in humans. Giardia lamblia is a parasite that lives in the intestines of humans and animals. It's expelled from the body in feces, and if it's near a body of water, the lake or stream will be contaminated.

Cramping, nausea and diarrhea are the most common symptoms of giardiasis. Symptoms may not show up for two weeks and once present can last as long as six weeks. If infected, get medical attention as soon as possible.

Cryptosporidiosis doesn't sound too inviting either, and for good reason. It's another waterborne illness involving parasites found in feces. The same symptoms as giardiasis can be expected, but more severe. Both of these parasites can be found in soil and vegetation as well, so wash anything you plan on eating in purified water and remember -- to give yourself the best chance at survival, you should always boil your water, even if it looks clean and clear.

Over the course of the day the plant will transpire and produce moisture that will collect at the low point. Poke a hole to drink the water or pour it into a container for later. The water will taste like whatever plant you choose, but it's better than nothing. It's also important to use non-poisonous vegetation. Once you're done, tie the hole shut and reuse the bag.

If you're near the coastline, a beach well is an excellent way to get drinkable water. Dig a 3-5 foot hole in the depression behind the first sand dune. This is typically about 100 feet from the waterline. Put rocks in the bottom of the well to keep sand from getting too active and line the sides with wood if you can -- this will prevent the walls from caving in. In a few hours, you could have up to five gallons of filtered water. If it tastes too salty, you should move further back behind the second sand dune.

Beach Well

This well technique works near any body of water. Dig swamp and lake wells closer to the water than the beach version. The same method also works in the desert during the wet season -- just dig at the low point between dunes, near vegetation. Look for moist soil in dry river beds and chances are you can find groundwater underneath.