most folks use saran or plastic wrap to cover the IV site. Make sure its a water tight seal before you shower, and try hard to avoid soaking it. I normally ask them to try hard for my left arm, since I use my right constantly. When your shower is over, take off the damp mess that will now be clinging to your arm, and make sure to PAT dry. DONT RUB. just dab, and pat. use a blow dryer if you need to to make sure that area is really dry again.

I hope you are feeling better soon.