Water is generally considered safe to drink but the water may have a corroded taste due to the old pipes. It should be fine with boiled water. You can use sterilising tablets, or use a microwave steriliser if you will be staying at a serviced apartment there. http://gohongkong.about.com/od/healthandsaftey/f/water_in_hk.htm
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You can use the traditional boiling method to sterilize the pumping parts. If you are worried about the quality of water in oversea, you can buy distilled water to boil them instead.
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