Is it safe to drink 1–3 week-old water from an old bottle? Science explains

Lingering water bottles can harbor unseen dangers. Research indicates that bacteria and mold thrive in these environments, potentially causing digestive issues. Plastic bottles may also leach harmful chemicals over time, especially when exposed to heat. Experts recommend washing bottles daily, opting for stainless steel or glass, and discarding water left for more than a few days to ensure safe hydration.