Carry a chocolate bar or something; this will keep you going until some food that you can recognize turns up. Drink bottled or boiled water, as the tap water is NOT safe to drink, this is for the whole of China. Even boiled water, while sterilised can contain a lot of minerals and iron deposits that you probably do not want in your system. The safest bet is to drink bottle water. Tap water in most big cities is OK.
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