As summer temperatures rise, it’s easy to leave a bottled water in the car without thinking twice. However, a parked vehicle can heat up quickly, often reaching much higher temperatures than the outside air. In this intense heat, plastic water bottles are exposed to conditions that may cause chemicals from the plastic to slowly leach into the water. While research is still ongoing, many experts recommend avoiding drinking water that has been sitting in a hot car for long periods.

Another concern is that heat can affect the quality and safety of stored items. Even something as simple as bottled water can lose its freshness, and prolonged exposure to high temperatures may impact taste and safety. Although a single short exposure is unlikely to cause serious harm, repeated heat exposure is not ideal for anything you plan to consume.

Beyond water, a hot car can be dangerous for many everyday items. Aerosol cans, lighters, batteries, and even certain medications can become unstable or less effective when left in extreme heat. Some may leak, expand, or degrade, creating unnecessary risks inside the vehicle.

The safest approach is to avoid leaving bottled water or other heat-sensitive items in your car during summer. Taking them with you only takes a moment, but it helps protect your health, your belongings, and ensures you avoid any unnecessary risks caused by extreme heat.