The plastic from bottled water often contains harmful chemicals such as phthalates and BPA. The former has been linked to an increased risk of cancer while the latter is known for causing hormonal disruptions in humans.
It’s also important to note that water does not expire, but the plastic bottle does come with an expiration date. After that, chemicals start leaching into the water.
Besides that, bottled water is equally bad for the environment because it contributes to the increase in ocean plastic waste.