Water is an essential part of all living things. Sixty percent of adult body weight consists of water. It is of utmost importance since it cannot be stored in the body and replenishing of the water must occur constantly. It serves various vital functions in the body. It forms the medium through which enzymatic reactions occur in the body. In addition, it retains turgidity of muscular cells that define the body contours. Water helps regulate the body temperature. When the temperature rises, the body mechanism triggers sweating which leaves a cooling effect. The fluid also serves as an agent of transport. It provides medium for transport of nutrients to the cell and transport of metabolic wastes from the cells. It is also responsible for ensuring smooth excretion process of catabolic products. Water, therefore, is essential to health as it helps regulate body processes. Apart from transport and cell integrity, water aids in detoxification processes by both diluting toxins and providing a medium for their excretion from the body. Thermo regulation process maintains the body at optimal health. This is because most body reactions are temperature sensitive and vital organs may switch from normal function when temperatures rise above 40 Degrees Celsius. In addition, water aids digestion and prevents constipation (Grosvenor & Smolin, 2006). Dehydration occurs when the water levels in the body fall below optimal. Validation of dehydration is based on body weight loss. There are three levels of dehydration based on total body weight loss; mild, moderate and severe. Mild dehydration occurs at weigh loss less than 3% while moderate level occurs at weight losses between 3% and not exceeding 9%. Above 9% body weight loss, severe dehydration occurs. This loss of water from the body is not positive and carries far bearing consequences. Serious consequences follow dehydration. Mild dehydration is not ease to detect since the heart rate and mental status remain normal. At moderate dehydration, a person becomes restless and thirsts for water. The breathing rate elevates as so does the heart rate. The mouth is dry and the urine output decreases. Severe dehydration causes tachycardia to develop, eyes appear deeply sunken, tears dry up and mouth and tongue become parched. Causes of dehydration include excessive sweating because of heat (for example during exercise), fever and humidity, failure to take enough water, diseases that increase urine secretion, diarrhea and vomiting. When severe dehydration occurs, most body functions are impaired. In addition, body weight loss occurs (Mandleco & Potts, 2011). Water loss affects the electrolyte function in the body. Clinically, there are three types of dehydration: isotonic, which is proportional loss of water and bodily electrolytes, hypotonic-where the electrolyte loss exceeds water loss, and hypertonic where water loss is in excess of electrolyte loss. Isotonic dehydration accounts for the majority of cases. Sodium forms the electrolyte in extracellular fluids. Movement of the electrolyte generates electrical signals necessary for proper functioning of the brain, nervous systems and the muscles as well as controlling the amount of water in the body. Proportionate loss of sodium and water causes iso