Drinking Water Filtration

Our family has been collecting water from a mineral spring for 4 years. We have used the 5 gallon #7 water jugs, which I understand have the dreaded bisphenyl-A compounds. Have looked around for a filtration system which will remove all problem minerals (chlorine, fluoride, arsenic, lead, etc). Have considered an RO system but I believe the water must be remineralized before drinking as ingestion of pure water may actually cause problems relative to health. We just found out we are pregnant with our third child and would like to resolve this issue soon in order to give our unborn child the bennies of my wife drinking healthy water. Thanks for any help.
Jim