I usually use poison bait on ants. Spray stuff gets into the air, and the place where the ants seem to be coming out of the woodwork along the floor is close enough to where our rabbits live that I wouldn't want to risk it. But the bait is self-contained - basically a covered plastic dish with some sugar-and-peanut-butter ant food laced with poison, and little holes for the ants to crawl in. They take the food back to their nest and feed it to everybody ... .