Before you get IV nutritional therapy, it's important to do a few things to prepare. First, make sure you drink plenty of fluids so you are hydrated. Even though the IV will give you fluids, it's still important to drink water. Second, eat a meal or snack that includes protein. This will help your body use the nutrients in the IV. And finally, wear comfortable clothes that are easy to roll up your sleeves. This will make it easier for the nurse to put in the IV.