What you will need:
*A small glass jar with lid
*Sharp, rusty items like nails, razor blades, or pins
*Sea Salt
*Red string or ribbon
*A black candle
Fill the jar about halfway with the sharp items. These will reflect ill fortune and ill intent from others. Add the salt for purification. Add the ribbon to bring protection. When the jar is halfway filled there are a couple of different things you can do. If you are not squeamish, you can fill the remainder of the bottle with your own urine. This identifies the bottle as belonging to you. Or you can fill the remainder with wine that has been consecrated and spit in by you. Cap the jar, make sure it's sealed tight and seal it with the wax from your black candle. White can also be used. Imagine a white ring of protection surrounding your bottle.
There are two things you can do with your witch bottle. One-bury it as far from your house as possible so that any negativity sent towards you will never reach your home. Another option is to hide your bottle somewhere in your home, under a doorstep, behind a cabinet, somewhere it will never be disturbed. It is believed that any negativity aimed at the house will go straight to the bottle. Whatever you decide, make sure your bottle will remain undisturbed permanantly.
As long as the bottle stays intact and doesn't break, it will work!