Just because a plastic bottle is labelled “BPA-free” does NOT mean that it is safe! There are still many chemicals that can leach into your water or food. Many of these chemicals are either endocrine disruptors (thyroid, ovaries, testicles, etc.) or carcinogens. PLEASE use glass whenever possible. Caution must even be used with ceramics as heavy metals can be in the different glazes. Stainless steel water bottles are second to glass since they, too, can leach metals and are very quality dependent. Read more here.