The lasic definition of water is as follows:
Water is a colorless, odourless and tasteless liquid.
This refers to pure water.
What we usually mean by water is the water in the rivers and seas or top water is the water in the rivers and seas or tap water and this water is a mixure of varius subtances.
The predominant subtance in these mixure is pure water but other subtances are suspended in the solution, usually mineral salts. The great variety of salts that can be suspended in water means that there are different types of water. Sea water has more salt content than river water. Top water also has salts and other subtances which are added to make it save for drinking.
The water molecule:
Water is made up of molecule consisting of atoms fro two elements hydrogen and oxygen. Each molecule is made up of one atom of oxygen and two atoms of hydrogen.
Notice that since water is in a liquid state the molecules are scattered about and can move relatively freely amongst themselves
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