When you buy one liter of water at the store, you're actually buying about six liters of water, Simran says. That's because when manufacturers make plastic bottles, it takes five liters of water to cool the plastic.

To save the resources used in creating all those bottles, Simran suggests getting a water filter and a reusable aluminum or plastic bottle from a company like Sigg, Nalgene or New Wave Enviro.

One thing to consider if you buy a plastic bottle is its grade. Look on the bottom of the bottle for a small plastic triangle with a number in the middle. If you see a number 2, 4 or 5, the bottle is safe. If it has some other number, don't use it as a water bottle. Those other plastics can make your water taste like plastic and leach harmful chemicals into your body. "You don't want your water tasting like plastic," Simran says. "If you're tasting plastic, you're ingesting plastic."