Barbara Ann - Rodinal!! It keeps for decades. HC110 concentrate has got a pretty long shelf life too. I've got indicator stop bath that's got to be over 10 years old, and I think fix is pretty hardy too.

Years ago I used to buy Ilfosol in little 500 ml bottles and always ended up throwing away at least half of it all dark drown and nasty.

This advice, of course, is offered on the premise that you miss developing your own.... if not - just do what works for you. It's all about having fun with photography.

P.S. Look forward to seeing your photos for this topic. I just developed some film last night shot with this in mind.