Water serves as a lubricant in digestion

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Water serves as a lubricant in digestion and almost all other body processes. The water in saliva facilitates chewing and swallowing, ensuring that foods will slide easily down the esophagus. Water in other digestive fluids sustains movement throughout the gastrointestinal system. The watery fluid surrounding such body parts as joints and eyeballs helps them move smoothly and is in fact their only lubricant.

Digestion is only the beginning of the series of biological events that takes place as food is incorporated into the human body. Eventually, the nutrients materials in some form will reach every cell. Nutrients begin their travels by entering the bloodstream, or circulation as water, which will carry them to where they are needed. http://www.chemcraft.net/wbody.html