Absolutely NO drinking from the tap, from streams, or lakes, or any other questionable water source. Iodine WILL NOT be sufficient. The only water you should be drinking is bottled (properly sealed) water.
In China, every room will be equipped with a hot water boiler. Please make use of this and boil water for brushing your teeth.[Edit by="Linda Truong on Jun 20, 3:32:36 PM"][/Edit]