White Vinegar
The pungent scent of white vinegar repels ants from entering the house, you can use a mixture of 50-50 vinegar and water and spray the ants.

The mixture is a natural repellant that is easy, effective and affordable. However, remember that the mixture will leave behind the vinegar smell.

Pepper

Ants detest pepper. You can sprinkle the substance in the entrance areas commonly used by ants mainly at the corners of the house. 

Also, you can use a pepper and water solution to spray the same areas. It is safe to note that the pepper does not kill the ants but rather repels them.