I would not tone in the kitchen. Always a good practice not to eat where you whatever.
You can store toner in a standard brown plastic darkroom storage bottle. However, storing and reusing selenium usually leads to a buildup of precipitate which must then be filtered (e.g. through a coffee filter) which I think is too much of a pain. For a small darkroom, I would try to avoid processes that lead to extra storage needs, i.e. use one shot chemistry.
What I do when I print is something like this:
- Make test strips to get to a final print
- Settle on the final print exposure including dodges, burns, flashes, etc.
- Make one final print that I like
- Then, I dial in the drydown compensation factor and make somewhere between 3-10 exposed sheets of paper (copies) depending on my preference for the print.
- I store the exposed sheets in a paper safe until I have a maximum of 20 11x14s or 10 16x20s which is enough to fill up my print washer.
- Then I batch process 4-8 sheets at a time with the single tray method, the final step of which is selenium toning.
So in a given darkroom session, I can generate 2-4 good prints with multiple copies, processed, toned, and washed. I spend most of the time with test prints, trying to get things right but then batch process so that I don't spend forever processing each sheet separately. I "develop to completion" to minimize any vagaries of the developing times when batching. I use only one-shot chemical so there is no storage and I always start with a fresh batch of developer and fixer.