I finally put the effort into finding sources for pH up that aren't from the hydroponics store, and it turns out I can get both, easily, in my small town.

calcium hydroxide is known in the masonry world as hydrated lime or masons lime. It's cheap (8$CDN for 25kg) and you can get it at any home building supply store. 

potassium hydroxide is sometimes also known as lye, however, take note that lye can also be sodium hydroxide so double…