[Chemical name] sodium chloride [Chemical formula] NaCl [Common or alternative name] Salt [Source and description] 
Grocery; Table salt used in cooking is sodium chloride, usually with anti-caking agents such as magnesium carbonate. "Iodized salt" contains traces of sodium iodide. Uniodized salt is available and is often explicitly labeled as such. Kosher salt, canning or pickling salt, or other large crystal salt is generally more pure. Water supply; For large quantities, uniodized sodium chloride can be obtained inexpensively from water softener suppliers.