"If it's healthy tap water here in America, absolutely yes," says Douglas Casa, PhD, a kinesiology professor at the University of Connecticut. "I think it's a colossal waste of money to buy bottled water. It's also obviously horrible for the environment, too."

"Tap water is more regulated than bottled water, and a lot of bottled water is just municipal tap water," says Kate Geagan, RD, author of Go Green Get Lean.

Although American tap water is filtered and cleaned, it still may retain flavors from minerals or chlorine. If filtering your tap water once it's out of your home's faucet helps improve the taste for you, these products may help:

ON-THE-GO PURIFYINGEveryDrop's Water Filter is a space-saving, portable option that can filter water for any size vessel (and up to 1 gallon in just 2 minutes). It's especially great to have when traveling. $20,

AT YOUR DESKPur's new slim Ultimate 11-Cup Pitcher removes 95% of mercury and reduces chlorine and minerals that can change the water's taste. The best part: When you're finished with it, it's fully recyclable, so it won't take up space in a landfill. $44,

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