I have good luck using red dead end caps. They twist on and off. Over time they will loosen so store IV bags upright.
We use golf tees to plug our IV bags. They work like a charm. I would recommend unpainted wood or plastic. We had painted wood tees and the paint started to flake off into the solution over time.
Someone else recently told me they use parafilm. That way you can have the bag hanging when you spike it, which you can't with the golf tees.
Anyone know the type of silicone? Like the kind for sealing in bathrooms and around sinks?