Reusable water bottles have become prevalent in many countries as people try to reduce single-use plastics. A recent study found that even bottles filled with clean water can still have germs if not cleaned properly. Researchers discovered that bacteria can accumulate inside bottles within a single day, especially when they are refilled often. The problem happens because bottles stay moist and touch the mouth and hands. Health experts said that regular cleaning is vital to protect public health and keep daily drinking habits safe and sustainable.

Specialists explained that washing bottles every day is a simple but efficient way to prevent health risks. Warm, soapy water and a bottle brush can help clean narrow areas like lids or straws. For deeper cleaning, some bottles can be placed in dishwashers or washed with baking soda and vinegar. Glass bottles are easier to clean, while plastic ones may trap germs in small scratches. Keeping a cleaning routine is beneficial for health and supports environmental protection.