Plastic bottle water vs Filter Tap water?

Someone please help! I don't want to buy bottle water anymore because of all the recent news about bpa and toxins in plastic bottling. I have an infant and 3 year old and I am very concerned about the safety of their water.
I wanted to get a water filter but lately read that ALL of U.S. water systems contain tons of pharmaceutical drugs that cause potentially dangerous side effects from long-term low dose exposure, Apparenttly the drugs come from sewer water that is pipe back and filtered into tap water except that the city's filtering process does not recognize nor remove the drug substances.
I'm having a huge headache now trying to decide what I can do to provide the best water for my children. I've heard that reverse osmosis system removes the drugs but they cost a lot and wastes up to 6 gallons of water to produce 1 gallon of drinking water...not very environmentally friendly for me. I've also heard people say that reverse osmosis kills the minerals in the water....
Anyone have any better ideas? which is the lesser of 2 evils, the bpa and other plastic toxins or the long-term low dose prescription drugs like chemo drugs they found in the water?

thanks!