In addition to your RO, do you also have a water softener attached to your incoming well water? We have very rusty well water but it seems the softer in our case makes our tap water very tasty. We still have RO but I don't hesitate to use/drink the tap water.There always seems to be a lot of discussion on using distilled, RO, spring, tap and well water. I started out using RO water in winemaking understanding the lack of minerals in it and the PH shift. Since our well water is so poor at my house, using RO was my only option short of purchasing water from the store. I like the taste of RO but understand the final wine taste might benefit from mineralized water.
As I've considered this more and more, I've finally decided to make future batches using remineralize water. I intend to do this by blending ConcenTrace Trace Mineral liquid into my RO water. I can taste, test and tweak the water blend as I see fit prior to blending with concentrate.
Not sure if it will make much of a difference but it might make me feel a little better about using RO.