A screened porch may look aesthetically pleasing, but it's not always ideal for privacy. For some seclusion, DIY a pair of budget-friendly outdoor curtains.
Any rod works for any kind of curtain header (the top of the curtain, where the fabric meets the rod), whether it has grommets ... from a DIY method to splurge-y rods with matching hardware.
One of the simplest tricks to DIY a shower curtain is to use a window ... If you're using a curtain with grommets or tabs, hanging it on the shower curtain rod should be easy with rings.