According to Wikipedia the water molecule in liquid water is (H2O)4(actually a little less than 4 on average about 3.6 or so) for liquid at zero C and (H2O)3 at 100 C.
You can read the details here.
http://en.wikipedia.org/wiki/Hydrogen_bond
Here is another site that agrees with this and talks about ice have (H2O)4.
http://www.wiley.com/college/boyer/0470003790/reviews/pH/ph_water.htm
How many hydrogen bonds can each (i) water and (ii) ice molecule form?
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