Sorry, but you really don&#x27;t want to be drinking true deionized water. It isn&#x27;t a about long term mineral loss, it is about the immediate discomfort of drinking it. It&#x27;s fine for the first cup or two, but after that it starts to burn. Wash your hands with it and you&#x27;ll find you skin is dry and cracking. You&#x27;ll notice that reverse osmosis systems intended for producing drinking water have a much lower standard of purity than those intended for, say, washing glassware. If you want to make sure there is no lead in your drinking water a carbon filter with an ion exchange resin stage is the way to go. But really, get over it, 99% of the US has safe tap water.