Documentation for Bottled Water as Ingredient

Hi, we switched suppliers for our delivered 5-gal bottled water jugs. What documentation will be required to have on hand for our SQF audit? 

I currently only have a long water quality testing report from an outside lab for the spring where it was bottled. Our previous supplier was a larger distributor, and we have a 3rd party audit, a dept of health certificate, and another lab test or COA for one of the shipments.

We have well water, and I am not 100% clear on why it's not safe for drinking (most likely the chlorine used to treat it?), but we bring in bottled water for employees to drink and for the occasional product we make requiring water. So since it's used occasionally as an ingredient, I assume we would need particular documentation for it. Any guidance appreciated, thanks!

They need to go through your supplier approval program and a risk level assigned         You should get a CoA for each lot you receive that it meets drinking water standards for your area

when did you last check your well water?