Chiayi is pretty far down south where their may be very little craft beer scene. You don't necessarily need foreigners living in the area to strive as a craft beer bar, but it definitely helps if there's a foreigner population since...we love to drink beer.
I don't think I've ever been to a craft beer bar where I didn't bump into a fellow foreigner.
I did a quick Google search and Chiayi people are suggesting others to go to Carrefour (Target kinda store) and Costco to buy their craft beers. Maybe this is your chance.
You can do some Googling yourself. Craft beer = 精酿啤酒.
On a side note, as others have said, you need a university degree to teach English. Some cram schools will overlook that, but those are the cram schools you probably want to avoid.
Maybe want to ask your friend to work his connections and see if he can help a friend out.