When in doubt you can make it with hardwood ash and water. I don’t know if you have any available to you, but that’s definitely not monitored. I myself don’t like dealing with it because you are having to deal with the highly alkaline material so much. I prefer to mix in granular bits. I did fine potassium hydroxide hard to locate locally, which is why I made it. But in my case I could use either NaOH or KOH.