You could make your own distilled water which has a neutral ph level.
http://www.youtube.com/results?search_query=making+distilled+water&oq=Making+Distille&gs_l=youtube.3.0.0l2.541.4271.0.6137.17.11.0.6.6.0.197.1339.2j9.11.0...0.0...1ac.yraDK9Hn73g
It's a pain in the ass and takes some time...