I know this is an old post, but some others may come across it...
I am also trying to figure out how to remineralize my water, I currently drink reverse osmosis water, but know it removes beneficial minerals as well as harmful ones. I would appreciate any furhter useful information or products you may find.
To clarify the difference between ion and free radical:The HYDROXIDE OH- is an ion; the HYDROXYL OH. is a free radical. Ions are formed easily and naturally when salts are dissolved in water; they are stable and exist in a dissociated state in solution.(i.e. the positive and negative ion(s) that make up a salt separate in solution) The only way to form a free radical is to have an electron "stolen" by another free radical, which results in a very unstable molecule that tries very hard to replenish its electron to get back to its ionic state. So, in short, any drops you may add to your water will be ions, not free radicals.