This case works great and can usually be found for a great value! Buy on Amazon here.

This one from Lakewood Double Reeds on Etsy is awesome, comes in lots of different colors and affordable! Win-win!

I like to use old prescription bottles from the pharmacy because they have a lid. Anything that the reed can be fully submerged in water in will do!

Your student will need to swab their instrument. I prefer silk swabs, and these ones from Hodge are great!