What is the ruling on some women performing ablution in a water basin and using that water as a precautionary measure against the evil eye, even if it has not occurred?

Ablution is not effective in warding off the evil eye before it occurs, and there is nothing to indicate its permissibility as a preventative measure. Protection from the evil eye is achieved by fortifying oneself with the prescribed remembrances (adhkar) and protective surahs (mu'awwidhat). This act is not appropriate; it is a yielding to doubts and delusions without justification.