Dear Family,

Thanks for agreeing to live with less for a week. Your challenge starts now!

This week, you will be eating at home every meal. No more eating out, no more takeout. And you have to eat your leftovers. If you throw food in the trash, you've got to 'fess up.

For one week, you're going to give up the bottled water habit. Get a water filter—time to get to know your tap.

No more disposable plates, cups, napkins or paper towels. Try cloth—you might like it!

For entertainment, you'll have to rely on each other. For one week, I'm asking you to give up your iPods and video games, and your computers only get turned on for homework. TV is limited to one hour per night—one TV only.

That thermostat is going way 69 degrees. If you get cold, put on a sweater.

Give your washing machine a break—try to wash only clothes that are TRULY dirty.

When you leave a room, lights out. Ditto for fans. When you're done using an appliance, unplug it. Don't forget your computer and cell phone chargers too.

Showers are going to be shorter—eight minutes max. Use a kitchen timer to help you keep track.

Want to go shopping? Head to your closets. That's your wardrobe for the week. The mall is off-limits.

You final challenge—no buying anything other than food for seven days.

Good luck,

See how two families took on Oprah's challenge!