Save your money while saving the earth. The Washington, D.C.-based Environmental Working Group released a report revealing that many bottled waters are no different than tap water—and, unlike bottled water, public water supplies are at least regulated by the government. So instead of shelling out cash for prepackaged “designer” water and sports drinks, think “green” and fill a SIGG or Nalgene bottle with filtered tap water.

Next: More budget-friendly fitness tips >>