Explanation:

Water is an unique liquid in the universe which solid form ice floats over its liquid surface . The effective density of ice is more than that of liquid water. When water gets solidified to form ice it is arranged in a tetrahedral open cage like structure geometrically. A water molecule forms four inter molecular hydrogen bond so that the effective volume increases i.e. anomalous expansion and hence glass bottle filled with water breaks when water freezes. Increase volume put pressure on the walls of the bottle and it will break.