Jon,
For the dental issues, there are much more technically knowledgeable forum members who can give you better advise than I can, but after radiation the blood supply in the jaw bone is diminished so dental problems becomes a nightmare.

I take it you can not buy things over the Internet?

Can the hospital's pharmacy help you get some of this?

Have you asked your medical team how the other patients going through this treatment at this hospital get what they need?

Also, if you can find a source for getting Biotene products you might not need 'Stoppers'. Biotene makes a dry mouth spray, mouthwash and toothpaste (I have heard their mouthwash also works fine as a dry mouth spray).