I think the best filter for water is this one in the link below. They say your body can't use these types of minerals but I think the hydrochloric acid in your stomach will break down and use some of the minerals.
If you have bad kidney's or mineral deposits you should drink distilled. You will need to add colloidal minerals once in a while as the food is now low in minerals. Colloidal minerals should not stay in your system for long unless the body uses them. You should also make sure you get enough Sea Salt in your diet.