I believe there’s a long running thread about the importance of stop bath somewhere here at Photrio…
there is, you are right. and in it PE acknowledged that a running water stop worked OK in some of cases. ...
personally, I don't believe everything i read on the internet - on photo sites it's filled with pissing contests of people who endlessly brag about their gear and troll ... and folks who proclaim that selenium is harmless because it is found in multi vitamins, or that you can substitute baking soda for fixer or if you process your film in universal developers like dektol or ansco 125 or 130 you will get golf ball grain and other nonsense spouted by people who must have heard it somewhere and just posted it as fact ...
as I said in the stop bath thread...i apprenticed for someone who was trained in the depression era and didn't use stop bath for 60+ years, and her thousands of 5x7 films, from the 30s and 40s looked perfect. as do the 1000s of negatives and FB/RC prints I have made since about 1980
getting back to the OP thread
what Ralph said .. if there are disruptions just get you just need metol and sulfite and washing soda to make negatives or instant coffee and Vit c; vinegar from the supermarket works fine as stop bath and thiosulfate from amazon the people who sold you the metol and sulfite a gallon jug of perma wash will last a lifetime like a small bottle of photo Flo.
there's really not much to making photochemistry that works as good as anything that might have been waylaid in a container from china.