Water works true miracles, applied both internally and externally. It performs many tasks in the body. As a solvent and transport agent, it supplies all cells with vital substances and nutrients and ensures that metabolic products are removed and excreted. This loss of fluid, which we excrete daily through breathing, sweat and urine, needs to be replenished. After all, the body suffers from no other deficit as quickly as from a lack of fluids. This is not surprising, because every single cell needs water to perform vital functions. Poor concentration, dizziness, headache, tiredness or nausea are the first symptoms of a lack of water.