Here's what you'll need for your ant bait stations:
Borax
Powdered Sugar
Bottle Caps
It's best to put these bait stations someplace outside, or in the garage or a shed. Try to choose an area that is somewhat sheltered, with a windbreak. It will also help bring the little guys out during the day if the location of the bait stations is shaded. That way you can tell how many are taking the bait home! *insert evil laugh here*
The idea behind this method is that the ants won't be able to tell the sugar from the Borax. They will take it all home to the colony, and the entire colony will ingest the Borax. This will cause them to be unable to absorb water, and they will eventually die.