Reverse osmosis isn't terribly expensive anymore. I have one under each sink in my apartment and have successfully moved with them. Since it's just me and my cats, I don't have to change the filters as frequently as suggested (I have an inline TDS meter that when that starts heading up, I start changing filters). I have added an alkaline stage because it does help with the flavor, not that the plain RO water was bad, it just tastes a little better.