You do not want to fill the mug up too much, just until it appears 1 inch deep with water. Mix enough salt into the water so it tastes salty. Start with a small amount of iodized salt and taste it to ensure it is salty. Make sure you fill the mug with more water if you drink some of it, as you want there to be a depth of about 1 inch of water in the mug. You will then need to rinse and dry the mug to ensure there is not salt residue in the mug. Once you have rinsed and dried the mug, you can put it in the center of the glass bowl in the 1 inch of salt water. Make sure the cling wrap is stretched tightly over the mug and the sides of the bowl, with no open areas around the rim of the bowl. Look for a window sill or a spot on your deck outside that gets lots of direct sunlight and make sure the bowl is on a nice, even surface in the sun. Place the small weight or rock on the top of the plastic wrap, right above the cup. The plastic wrap should sag in the center of the cup due to the weight of the rock. This will ensure the condensed water falls into the cup so you can drink it. After several hours in the sun, there will be a build up of humid air in the bowl. This will lead to the formation of water condensation on the plastic wrap. The water droplets should then flow downward into the cup. After the bowl has been in the sun for three to four hours, check the cup for a small amount of water. Remove the plastic wrap and drink the water in the cup. You should taste pure, clean fresh water that has been desalinated.  This desalination device works by using the sun to warm up the salt water. The plastic wrap helps to trap the water vapors in the bowl as the salt water evaporates. Because the top of the plastic wrap is much cooler than the rest of the bowl, the humid air in the bowl condenses on the top of the plastic wrap and forms water droplets. Over time, the water droplets on the plastic wrap grow larger and start to flow to the center of the bowl due to the weight of the rock. As the water droplets build up, they grow heavier and eventually fall into the cup. The result of this simple desalination device is a cup of fresh drinking water that does not contain any salt.
صب 2.5 سم من مياه الشرب في المج. ضع الماء المالح في وعاء زجاجي كبير. غطِ الوعاء الزجاجي بورق البلاستيك. ضع الوعاء في أشعة الشمس المباشرة. اترك الوعاء في الشمس من ثلاث إلى أربع ساعات. افحص كوب الماء العذب.