Caffenol is a bit labor intensive but it does work well.
For stop bath, you can use regular white vinegar (the type you find in the grocery store) and dilute it 50-50. That works well.
Some people just use plain water, but that's slower and can affect the fixer's life a bit.
Here's a formula for a very simple regular fixer
Orwo / Agfa Fixing Bath 301
SOLUTION
Sodium Thiosulphate 250 g
Potassium Disulphite 15 g
For films, fixing time: 10 minutes.
Potassium Disulfite is the same as Potassium metabisulfite, Potassium pyrosulfite.
If you want a rapid fixer, it contains a few more ingredients. I can post a formula.
When developing, save the film leaders as you can use them to test the fixer.
I also have developer formulas that are simple to mix. The big advantage they have over Caffenol is that they are shelf stable for much longer.