Don’t overuse your bath towel. Like most things, your wet bath towel can grow bacteria if it isn’t properly dried out. Even if it is, microbiologist Philip Tierno recommends only reusing it three times.
Don’t leave your tub dirty. Tubs rarely dry entirely, allowing it to become pretty gross and full of bacteria like E.coli. Cleaning it on the regular will help prevent infection.
Don’t shower in hard water. Hard water not only keeps you from getting clean, it can ruin your hair and dry out your skin. If you can, make sure to have a water softener and keep it full of salt.