If you'd like to use traditional curtains instead of vinyl, you can create waterproof bathroom curtains by "waterproofing" the fabric. For those who would prefer not to do this, the best way to accomplish this goal is to take the curtains to the dry cleaner, and they'll waterproof the fabric for you. Otherwise, you'll need to purchase a product that will create waterproofing fabric. Read the product's instructions for how to care for the material first, which is typically washing it to rid it of any chemical treatments and avoid any fabric softeners or scented cleaners. When applying the fabric waterproofing product, be sure to work in a well-ventilated area and to test a small section of the material before beginning.