Doctors are warning against drinking water left overnight in vehicles, particularly water stored in plastic bottles. High temperatures inside cars create an ideal environment for bacterial growth, turning the water into a breeding ground for harmful microorganisms. This contaminated water poses a risk of acute kidney injury and other health problems if consumed. The heat also causes plastic bottles to leach chemicals like antimony into the water, exacerbating the risks. Experts recommend avoiding leaving water bottles in cars and opting for stainless steel containers if necessary. Symptoms of kidney damage include nausea, vomiting, and fatigue, requiring immediate medical attention. Prioritizing hydration with fresh, clean water is crucial for maintaining overall health.