Because water is a liquid and one of the main properties of liquids are that they are wet, water is also wet.
Another reason is also because water is a compound meaning that the stuff that creates it (hydrogen and oxygen) lose their properties when thy are mixed together.
It is a liquid and acts as such Water is a wetting liquid but Mercury is non wetting so not the all liquid are wetting it depends upon Adhesive and cohesive forces.
Liquids having strong adhesive force than cohesive become absorbed on a solid surface and that surface becomes wet but the liquids having strong cohesive force can not absorbed on a solid surface so material remains dry and such liquids are non wetting liquids as Mercury, so water is wetting liquid due to its strong adhesive force.
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