It's difficult to pinpoint exactly when it happened, but sometime over the past decade or so, the general population of this country formed a belief that bottled water tastes better than tap water — and is safer and healthier, too. It is not difficult to figure out where this idea originated. It was with bottled water suppliers. It was pretty ingenious to convince otherwise normal people to pay between 240 and 10,000 times more to purchase water in a bottle than to get it from the supply we're already paying for that comes out of the taps in our homes.

TAP WATER IS CHEAPER.

These days, a 16-ounce bottle of "spring" water goes for about a dollar, which works out to about $8.00 a gallon — twice the cost of milk, and about par with bottled soft drinks. Home delivery of water in those great big, heavy bottles is less per gallon but still around $40 a month, according to online averages.

The average household cost for town water in the U.S. is 66 cents per cubic meter, which is 265 gallons, or 4,240 8-ounce glasses of water — enough to last the average person 530 days (consuming eight 8-ounce glasses per day). Another way to price it: Sixty-two 8-ounce glasses of water cost about 1 cent total.

TAP WATER IS SAFER.

This may startle you, but it is absolutely true: Tap water is safer than bottled water. How could that be? The reason is simple. The water supply in the U.S. is regulated by the Environmental Protection Agency (EPA) under very strict guidelines and rules that are heavily enforced. Bottled water is subject to FDA rules, which are far less stringent. For example, tap water by law requires disinfection. Testing for bacteria must be conducted hundreds of times per month. Bottled water, on the other hand, is not required to be disinfected; the frequency of bacteria testing is fewer than five times each month.

TAP WATER IS HEALTHIER.

Tooth decay in children is making a big comeback. The culprit? Bottled water. It's not the water that's causing the decay, according to the World Dental Congress. It's the lack of fluoride. Parents believe they are giving their children a superior product in bottled water, but in fact they are depriving kids of the fluoride and minerals they need to build healthy teeth and bodies. Fluoridation, present in most public water supplies, has become recognized as a key intervention in tooth decay.

So the next time you feel thirsty, don't reach for a bottle. Instead turn on the tap. You'll be drinking water that is just as safe, or safer, than bottled water and saving money, too. Get the kids to switch and you just might head off big dental bills down the road as well.

Tip: Don't like the taste of your tap water? Invest in a filter pitcher or install an inexpensive faucet filter.

Mary invites questions, comments and tips at [email protected], or c/o Everyday Cheapskate, 12340 Seal Beach Blvd., Suite B-416, Seal Beach, CA 90740. This column will answer questions of general interest, but letters cannot be answered individually. Mary Hunt is the founder of www.DebtProofLiving.com, a personal finance member website and the author of "Debt-Proof Living," released in 2014. To find out more about Mary and read her past columns, please visit the Creators Syndicate Web page at www.creators.com.