Why do biological systems need water?
Water is means of transporting material, can be utilized as a solvent, and also functions as a coolant and lubricant. Water’s unique ability to moderate temperature and to break down substances, is what allows for water to be used like so.
It also part of dehydration synthesis [removal of a water molecule to create a bond] and hydrolysis [reverse of dehydration synthesis] which creates and breaks bonds between molecules to make something more complex, or to break down something complex. For more details on Dehydration synthesis and hydrolysis, see 'Magical Water' under 4.A.1
Water’s various unique properties make life on Earth suitable and possible for us organisms. Without water and its bonding properties many macromolecules would not exist, which would disrupt the levels or organization [see 'Why does matter matter?' for chart], causing all biological systems to be nonexistent. 
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