My wife made homemade soap , shampoo and such using old methods that use lye and oils and fats (like lard)
She always bought the lye, but I believe you can make it out of ashes.
Anyway also all of the ingredients would be things you could probably get or make in a true survival situation..
We haven't purchased fake commercial soap for a couple of years.
Sometime we do get anti bacterial soap during flu season and such, but generally just use homemade soap.
She used to make enough to sell the extras at farmer's markets, but there wasn't much profit so we just make it for ourselves.
it is a lot of work and lye is dangerous.
But it might be a good skill for both self sufficiency and if you like being a home chemist
