You can use reverse osmosis for everything else but drink only distilled water. If you already have a reverse osmosis system for the whole house that should do it. As far as filtered water goes that's the best way to do it. Reverse Osmosis.
Distilled water has no minerals in it. The human body cannot process and use disolved minerals. It needs ionic minerals that are only available from food.
It's the disolved minerals from the water that end up in the joints and arteries and thus arthritis and heart disease develop. Pretty simple.
To drink distilled water and take your daily oils (olive and flaxseed) goes a long, long way to prevent arthritis, heart disease and even cancer. I explian how in my book and CD's.
Keep trying to convince your wife of the value of distilled water. Ask her politely, say please, pretty please, beg her, bribe her, whatever it takes. Someday she'll thank you.