Originally Posted By: eljefino
The typical JCI battery lets you pry the octagon things out and add water, even though they sit flush with the battery case. Not like the old ones with six soda-bottle tops that obviously came off.
They usually add minerals to "drinking water" so it tastes better (?) so you want the pharmacy grade stuff that's actually distilled.
The minerals they add are in small amounts, usually less than 15 ppm total. Some are straight RO water though. The really cheap stuff. It will say on the bottle.