Don't you hate it when you rush into the kitchen for a quick breakfast and find that you've been invaded by a colony of ants? You spend all your precious time intended for breakfast squishing them, trying to eliminate the food source that has attracted them, and writing "ant spray" on your list.
Here's a proven homemade solution to your problem that has low toxicity for humans and pets: Boric acid. What you want to do is feed those ants with something they like, laced with something that will eliminate the whole colony. Determine whether you're dealing with sugar ants or grease ants, then prepare your bait and place it out of reach of children and pets. The ants will partake and carry your gourmet treat back to their queen and soon you will have your clean kitchen to yourself again. For sugar ants, mix mint jelly and Boric acid. For grease ants, peanut butter and boric acid. This wonderful online article from About.com will give you detailed instructions.