Whenever you travel it is always a good idea to have some bottled water with you. Bottled water is inexpensive and easy to find in China.  Most breakfast buffets at hotels in China will offer a juice that looks like watered down orange juice.  I want to caution you about drinking this. It may have been mixed with water that isn’t safe for you to drink.  A surprise for you will be with the milk.  The milk served may be hot milk; there may also be soy milk available as well.  Also, there is a high probability that the coffee will already have milk added. Enjoy!