Food and Water
Take care of contamination of water and food problem. Always drink safe mineral water and take well-cooked food.
Drink bottled water only, bottled water is inexpensive and readily available in China. If there is no alternative to tap water, ensure it is boiled. In China, the most famous brand of bottled water is Wahaha.
Local tea is commonly served with meals and there is a variety of soft drinks, local and imported beers and wines available for purchase. If you like a 'cuppa', you may like to bring along a small supply of tea bags, coffee and milk powder. Most rooms have electric jugs or thermos flasks of boiling water to make hot.
Avoid eating buffet meals, even in expensive hotels. The food may become contaminated due to over-exposure
If you are buying from roadside stalls or hawkers, bargain you must. Start by offering half the price they ask for and settle for 70 - 80 per cent. Don't bargain in proper shops especially those that display "Fixed Price" signs: that will be seen as bad manners.
Never buy food from roadside stalls or mobile canteens. Not that they are bad, but your system may not be accustomed to such delicacies and you might end up spending more time in the loo than normal.