Follow the package directions. Double the recommended dose for cloudy water. While the three methods described above will remove only microbes from water, the following two purification methods will remove other contaminants. Distillation will remove microbes, heavy metals, salts, most other chemicals, and radioactive dust and dirt, called radioactive fallout. Filtering will also remove radioactive fallout.
Distillation involves boiling water and collecting the vapor.
The vapor condenses back to water, but will not include salt and other impurities. To distill, use a clean pot with a lid that will stay in place and cover the pot when placed upside down on the top. The lid needs to have a handle in the center, or near-center, top. Fill the clean pot halfway with water. The cup should hang suspended above the water, not dangle into the water.