If the bottled water has a pH lower than 5.5, then it has the ability to dissolve enamel, which is the hard protective outer ...

Glass-bottled water is sustainable but heavier and pricier ... they are less eco-friendly unless made from recycled materials. Glass bottles, though heavier, are more sustainable.

If you live in a place with "hard" water, or water with lots of chemicals, you can even use distilled water to protect your hair when washing it. However, since distilled water doesn't have minerals ...