You can get heater elements that work on 120V instead of 240V, but you'll probably need two of them in your kettle since they aren't as powerful. Look for 1500W or 2000W elements. Those are almost always 120V.
Also, you will not be able to plug them into the same double-outlet on the wall.
2000W elements need 16.6A and 1500W elements need 12.5A. Most general purpose household outlets are fed by 15A breakers. Sometimes 20A breakers. But, that means you need to plug one element into an outlet fed by one breaker and then plug the other element into a different outlet powered by a different breaker.