Johnnyb53 & Jsmoller : For a detailed discussion on water (including R/O) please see the Water-related threads below.
For my money I use H2O prepaired for use in batteries; pretty much the finest water product for the cost but availabity may be a problem for some.
For my money I use H2O prepaired for use in batteries; pretty much the finest water product for the cost but availabity may be a problem for some.