Borax is a very cheap material that you can buy in hardware stores. This powder is safe for humans because it is even used as an ingredients for slime which is a popular toys for kids. If you mix Borax with either honey m maple syrup or a home made sugar syrup and place it to the places close to ants, Ants will take it home as food. They will even feed it to their queen. Once the ants ate the sweetened borax powder, the ants will die. Your house will be ants free!