If you have a problem with ants in your house, mix equal portions borax and sugar, add enough water to make a thin paste. Place the bait in shallow containers (I use jar lids) and set them out where the ants frequent. Usually a couple of days later the ants are gone.
Borax can be found in the laundry products aisle. Though this bait is nontoxic, it can cause an upset stomach for pets and children (think of eating soap) so it is still wise to place the bait out of reach of pets & children.