I have used many different types of witch bottles. They are an effective form of magic that can be used for a variety of purposes. The protection witch's bottle is made to aid in the protection of ones house or person. Filled with oatmeal and salt with other herbs this bottle can absorb negative energies while blessing a home. Many times they are placed in the center of a house out of plain site. They can also be placed in the foundation as the house is being built or placed behind a wall during construction or remodeling. One can make a personal spell bottle to wear or carry with them as well.
A witch's bottle or a spell bottle can also be made to curse or harm a person by adding things that are not so nice. One of the most famous is the bottle filled with vinegar, pins, and stinging herbs to give a person a bladder infection.
Spell bottles can be made to aid in banishing, fertility, protection, cursing, love, healing, etc. The possibilities are endless.
My own spell bottles have worked well in protecting all I hold dear, cursing those who have wronged me or one of my loved ones, banishing what needed to be gone from my life, and so much more. It is actually one of my favorite types of magical workings. ;)