If you need another reason...

...to stop drinking bottled water (and trade in any dangerous Nalgene bottles for their new and improved BPA-free ones), read this article reporting the findings of an impromptu study performed at the Harvard School of Public Health. Some highlights:

...Researchers from the Harvard School of Public Health found that people who drank for a week from the clear plastic polycarbonate bottles increased concentrations of bisphenol A - or BPA - in their urine by 69 percent...

...Numerous animal studies in recent years suggest that low levels of BPA might cause developmental problems in fetuses and young children and other ill effects. The health effects on adults are not well understood although a recent large human study linked BPA concentrations in people's urine to an increased prevalence of diabetes, heart disease, and liver toxicity...

...Led by Jenny Carwile, a Harvard School of Public Health doctoral student, 77 Harvard students in the study drank all cold beverages from stainless steel bottles for a week to wash BPA out of their bodies and minimize exposure. Most BPA is flushed from people's bodies within a matter of hours. During that week, the students gave urine samples. Then the students were given two refillable polycarbonate bottles made with BPA to drink all cold beverages from for one week. Urine samples taken over that week showed the students' BPA levels spiked the second week to levels normally found in the general population. Because the students did nothing different in their schedules other than drink from the BPA bottles, the researchers determined their urine concentrations largely came from the bottles...