[Rudeofus]

Bleach needs some air, so it can go in a single bottle. Fixer and final rinse don't really care one way or the other. Although you can often just mix it as you need it.

I agree about the bleach and the final rinse but would advise caution with the fixer. The fixer is mostly Ammonium Thiosulfate which will go bad eventually, especially when mixed into a working solution. Unless you plan on using the kit within a few months, I recommend a procedure where unused concentrate is kept in a tightly sealed bottle (or several of them, depending on use), and working solution is only mixed as needed and used within a few weeks.

And yes, I have had fixer concentrate sulfur out on me in less than a year.