Take showers instead of baths.

Spiders are in the class Arachnida, the word you are looking for is arachnophobia.

A person with a fear of spiders might not get close enough for a positive identification. Perhaps your bath spider was not a black widow.

If it was a black widow in the house, just be cautious of reaching in behind stuff. Perhaps someone knows of a lure.

BWs hunt at night, usually not too far from their messy, disorganized web. Do some major house cleaning....vacuuming....in nooks and crannies, under furniture, etc. There is no escaping the housekeeping chore, sorry.

If you see another one in your bathtub or anywhere else, use a spray bottle with soapy water, household cleaner, or similar to slow them down so that you can capture/squish. BWs don't jump, don't worry.

Though a black widow is one of the easiest spiders to ID, I agree that an arachophobe might think that all black spiders are widows. How certain of the ID are you? Not that it makes much difference.....no one wants a spider in the tub when we're ready to take a shower!