What is the ruling on killing ants found in the house without verifying their potential harm, and is it permissible to kill them with poison, and what is the best method for that? And what should be done with ants in the bathroom if they are affected by water? And is it permissible to dispose of a trash bag containing ants?

It is forbidden to kill ants unless they cause harm, because the Prophet, peace and blessings be upon him, forbade killing four creatures, and among them is the ant. It is permissible to kill them when they cause harm, using pesticides or other means, but not by burning, because the Prophet, peace and blessings be upon him, forbade torture by fire.