Welcome, I will do my best to help you with your issueBoric acid is the safest effective agent for getting rid of ants.
It comes in powered form and is available at most hardware stores and home centers. Cut down a paper cup to an inch or so high then cover the bottom with the boric acid powder with a little sugar mixed in. Put the cup under the sink or even on the counter top but out of reach of kids or pets. The boric acid can be harmful if ingested but, unlike pesticides, is not harmful on contact