I mean, what happens to the minerals in your body that you're saying it strips? It sounds like it goes into the water when you drink it, which your body then absorbs...
You pass the water as urine.
OK, so your body never gets the minerals out of water (they get lost in urine). Thus you want the water full of minerals when it enters so it won't take any more when it leaves.
That's the executive level summary. You don't want the water stripping your minerals as it leaves.