It is important for our body to have a fluid intake of at least 2 liters of water a day. Water is very important to keep all bodily functions in a healthful state. When our bodies do not get enough water it will produce signs that it is in need of more water. These signs can include muscle cramping; muscles will start to cramp when it is depleting electrolytes through physical exertion, or excess sweating and overheating. Water is needed to replace the vital electrolytes wasted. Dark urine is a sign of lack of water by the kidneys, because our kidneys are used clean waste from our bodies, the dark urine indicates a low water intake and depletion. Lower urinary output is also a signal from the kidneys that our body is need of more water, it is sign from the kidneys of dehydration. Dark circles under the eyes can be a sign, because water is used to replace the lubricating tears our eyes produce. Joint pain is also similar to the dark circles, because our bodies require fluid in our joints as lubrication and cushioning. Water helps maintain the joint fluid, so the body will show signs of needing more water with pain. Water helps the gastrointestinal tract with digestion and elimination of waste, so constipation is another sign that your body may be in need of more water. Your skin, as well needs water on a cellular level to help in lubrication and keeping skin elastic and supple. Dry skin can be indicative of dehydration. Our bodies are made up of 70% water, and it is important that we drink enough water on daily basis to be healthy.