Dilute Or Not?

Good Morning All!
I am going to brew an all grain Wit(biab) in a few hours & have a water issue. The water i plan on using is well water from my inlaws. It has no odd smell or appearance, but they said its high in lime. Due to the apparent high total hardness, should i dilute it with bottled drinking water? The batch calls for 8+ gal. I plan on getting it tested soon, but am brewing today regardless. What would you do? Thanks. :?

I’m no expert but if you are planning a wit w/ water on the alkaline side, I would dilute w/ some distilled water. How much? Hard to say
as it’s all just guess work at this point.

Another option would be to start w/ all distilled or RO water and start w/ a blank sheet, adding minerals back.