If you could only prep one kind of soap, what would it be?
There are always hundreds of answers to that question because there really isn’t a single ‘best’ soap to store; almost any soap is good to stock up on compared to none at all. If they have to, people can make do cleaning most things with just about any common soap. If you make your own soap, that is a very frugal and admirable skill. Homemade soap is a good option if you have time to make extra and stock up on it. The important thing is having supply soap on hand for hygiene and sanitation if the store is sold out or closed.