Go to AltaVista WEB Search. Enter the following ('+' and '&' included) in the Search field: +"ants" & +"non-toxic" & +kill Then press the Search button.
You will get a number of 'hits' that talk about killing ans with non-toxic chemicals. (Or simply sites that talk about 'kill', 'ants', and 'non-toxic'.) In any event, one of the sites, among others, is Do-It-Yourself Bug Control. In the text of this page, you'll see a URL labeled 'click here'. Search THAT page for the work 'ants' until you get to the one text that talks about the ants you have. You can purchase this stuff from them by going back to the previous 'page' to call their 800 number. I offered this site because you can e-mail them, call them, and even buy from them. Outside of this, you're on your own.