The reason ants are coming into your home is because it's a free-for-all. If you have a very dirty home environment ants will multiply. Make sure you clean daily; the cleaner you keep your house, the less they'll have to eat, and the more they'll look elsewhere for goodies.
- Wipe down all surfaces. Tables and counter tops should be regularly sprayed and cleaned with a mild bleach or vinegar solution. Stay on top of your regular cleaning regimen; mop and vacuum regularly.
- Put food in air-tight containers.
- Keep the sink clean: no dirty dishes, no standing water for ants to drink, and no food in the drain.
- Put pet food bowls in a slightly larger bowl and add some water to the larger bowl, creating a moat around the pet food that the ants can't easily cross.