In Zhuhai, and the rest of China, the plugs sockets look similar to European ones, however they will not fit. You can pick up a travel adapter in and Chinese market for about 20p, so unless you desperately need power straight away, I would buy an adapter here.
Water- Do not drink the water under any circumstances. Not even the locals drink the water. If you are looking for water purchase a water cooler (like you have in offices). It costs around 50 RMB the first bottle you buy, but this is a deposit, and bottles will cost you around 10 RMB a time as long as you keep the bottles.
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