This tells you about most of the different water treatment technologies. http://en.wikipedia.org/wiki/Purified_water
P.S. De Ionized Water is great for washing your car and windows. It doesn't have any minerals.No water spots. No need to dry your car with a towel.
Look into O3 - Ozone Pure Ozone Faucet Tap Water System.
These Ozone faucets are suppose to be good for removing chemicals off your fruits and veggies.
Ebay and Amazon have a lot of them. There is also a OZONE Washing Machine thing that you hook up into your cold water line. No Hot Water. No Bleach or detergent needed.