Kill ants in lawns with coffee grounds
Kill ants in lawns by pouring one pound coffee grounds in one quart boiling water over the anthill. A very big anthill may require a larger amount of coffee and hot water.
Pull up the draw bridge: If the ants are already in your house, put your pot of honey and pet food dishes in bowls of water to make anti-ant moats. A little dish soap in the moat water helps!
Equal parts of dry baking soda and powdered sugar will kill ants.
Treat your ants to lemonade! Blend citrus peels with water, strain, and put in a spray bottle, or put a little citrus solvent in a spray bottle of water. These citrus sprays will kill the ants.
From: Slug Bread & Beheaded Thistles. Ellen Sandbeck.