Katie Couric's Notebook: Bottled Water

Take a walk down the street or through the park and you'll see them – people of all ages toting bottles of water. Last year, Americans drank nine billion gallons out of those little plastic bottles. Sure, it's healthier than soda, but all that plastic is just as bad for the environment, creating an estimated 1.5 million tons of waste each year.

So, more and more places are banning bottled water. Washington University in St. Louis will end almost all sales by the end of this semester. San Francisco declared it a no-no in city offices last year. Other local governments may do the same.

Some brands, including Coca-Cola's Dasani and Pepsi's Aquafina, come from the tap – and supporters of these measures argue you're better off just filling a reusable container at the water fountain for free.

A cheap, calorie-free alternative that doesn't hurt the environment. Now, I'll drink to that.