Step 1: Materials
Empty water bottle
A nice strong magnet (I got mine from the speakers of a broken shower radio)
A Paper clip or two
Duct tape (Mainly to make it look more manly...some practicality too. You'll need some kind of adhesive)
Step 3: The Paper Clip
It's important that you now know how you want yours...cup, or pedestal. Position the magnet so that metals will be attracted to the right side, depending on what you're making.
Step 4: Decorate!!!
If you're making a cup, and like the way the inside looks, you're done. If you don't like the inside, put some tape there too. Congratulations! Put in some screws and tip it over - watch nothing come out!