Great information was supplied above by bilproject.
At our cabin we use Pura UV-B-3 three stage filter. The filtered water goes to a separate spigot installed on the sink and to the ice maker in the refrigerator. All our guests are shown the spigot and told that it is the drinking and cooking water supply.
I replace the filters every year and the lamp about every 3 years.
http://www.purauv.com/puraundersink.htm
I also use a sediment filter for all the water to the house. It clogs quickly and will restrict flow if not replaced every few weeks. A sediment filter does not purify the water.