WATER. WE CANT LIVE WITHOUT IT. 

Water is a good solvent in part because it is a polar molecule. This means that polar and ionic substances, such as salt, readily dissolve in water. Water's properties as a solvent allow it to promote life because rather than having to transport solid materials, organisms can dissolve metabolites and nutrients in water, allowing them to move more easily through the body. Many organisms use water to flush toxins and poisonous by-products from their bodies as well. Water also facilitates the bending of enzymes, allowing them to produce necessary chemical reactions within the body quickly.