Keep spills cleaned up and never leave any food source around for them to find. They are there for food, keep it clean and they will go away. they are eating crumbs, and food from unrinsed dishes on the counter.
I just spray the trail leading inside with ant spray. Put a couple of Ant traps in your cupboards and keep everything cleaned up good. If you can follow them to their nest, pour some boiling water on it and they'll head off elsewhere.
Put out poison ant traps(its more like bait).... so you dont have to spray harmful raid every wear. Just put the bait were you see the ants coming from/entering. And in about 1-2 maybe 3 days they are gone and just dispose the bait and the ants! But dont worry about to many ants to clean up. Most of them have brought it back to the nest and soon the other ants die (so basically the whole colony dies! Hope i helped! <3