If you want to get crafty acquiring your base, there's some teks out there to get koh from hardwood ash. I've heard its as simple as boiling the ash in water, filtering and evaporating. Also, its almost free except gas/electricity for the stove and some hardwood to make ash.
http://www.lifeunplugged...e-lye-from-wood-ash.aspxBut know, lye is extremely dangerous when not handled properly, only do this ^ if you think you can and will handle the risks involved.
Edit- my bad, it seems you get potassium carbonate from boiling woodash. But with that and slacked lime you can get koh. this is from wiki-
Historically KOH was made by boiling a solution of potassium carbonate (potash) with calcium hydroxide (slaked lime), leading to a metathesis reaction which caused calcium carbonate to precipitate, leaving potassium hydroxide in solution:
Ca(OH)2 + K2CO3 → CaCO3 + 2 KOH
Filtering off the precipitated calcium carbonate and boiling down the solution gives potassium hydroxide ("calcinated or caustic potash"

. This method used potash extracted from wood ashes using slaked lime. It was the most important method of producing potassium hydroxide until the late 19th century.
I'd be willing to be you could replace sodium carbonate with potassium carbonate to get sodium hydroxide as well.
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