* 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. * 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 but make sure the plants are not 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.