You biggest hurdle is going to be crossing the bridge of what will most likely prove to be high water alkalinity (as measured in CaCO3 ppm units, or alternately in mEq/L units). And you can't do that without either a pH meter with which to bring all water to pH 5.4 via lactic or phosphoric acid addition, or alternately without a water analysis.
You can determine the waters alkalinity via a KH test kit. And likewise its general or total hardness (calcium and magnesium content) with a GH test kit. Look for GH/KH fish tank water test kits on Amazon.com. Test, then convert results to ppm, and lastly utilize software to proceed. The Kaiser Water Calculator can accept GH/KH readings directly, and it will do the conversions for you.
Even after removing the alkalinity from your water, a grist such as NEIPA will likely require some additional acidification, and the software will assist here as well.
