As above - These are the things I really appreciated:

1. A child-sized toothbrush with a very mild kid's toothpaste
2. Ora-gel (or something similar for mouth/tooth pain) for the really sore spots on my tongue.
3. Dental wax - if any teeth are sharp and irritating
4. Cream-type Lip Balm - without menthol or wax
5. A supply of Boost, Ensure or the many other meal replacement drinks
6. Keep the ice trays full in the freezer if he can only drink cold or ice-diluted drinks
7. A small mortar and pestle to grind up meds that are not available in liquid form.
8. A bunch of shot-glasses (this was all I had then) or a pill organizer to keep track of meds
9. A journal to keep track of a whole bunch of stuff! (I can't even list all of them here.)
10. A heating pad - it's great if you've lost a bunch of weight and feel cold all the time.
11. Colgate Prevident Sensitive 1.1 Fluoride toothpaste. (non-prescription in Canada) Comes in a mild fruit flavour too.
12. Little applesauce, pudding, ice cream, Greek yogurt and fruit salad containers etc.
13. Yes - skin cream is wonderful Glaxal Base was great and non-prescription.
14. Many, many bottles of Club Soda. Seems to be more of a Canadian Rad doctor recommendation thing vs. the baking soda/salt/warm water recipe that other countries use. I just found it way more convenient, and so did my husband. Still addicted.

If I remember more I will let you know, as I'm just staring to remember things after a year since treatment
Ive only listed the stuff you can buy - not the physical or emotional support you can do.
I am female and had oral tongue cancer vs. throat cancer, so throat cancer peeps might have a different set of things they appreciated.

BTW - I hate soup, and now have a freezer full of soup from friends and family. Ask him how he feels about soup before you spend days making it! haha