Bottled water has a dirty secret: it may actually be tap water. Regulations for bottled water don’t have to be as good as those for tap water, and water companies are not required to tell you where the water you’re drinking is coming from or how they treat it. Watch to find out what else bottled water may be hiding.

An alternative to bottled water is filtering your own tap water and bottling it yourself. Click here for your guide to the best water filtration systems.

Click here to see if the tap water in your area is safe.

Click here to watch Part 2.

Click here to learn more about bottled water.

Want to know how to look marvelous without splurging so much? Dr. Oz invites three beauty experts to share the smartest ways to save money while looking fabulous starting from your hair and makeup tools to the beauty products you use.