Medical Hydration Station (San Diego): IV rehydration is a common and relatively safe technique to deliver fluids and electrolytes intravenously. Dehydration occurs when your body loses too much fluid. This can happen during hangovers or losing large amounts of fluid through diarrhea, vomiting, sweating, or exercise. Patients who are stable and who dont require hospitalization can have their IV hydration therapy administered in the comfort of their hotel room. By appointment only.