Nate,
I don't know exactly what Evans contains today. People say the earliest versions were pure propylene glycol, which is safe since used as a food additive. I used their latest (NPG+, I recall). Regardless, I wouldn't drink it. Some say you can go cheaper and use straight anti-freeze w/ no water, some saying a newer "environmental" coolant is pure p.g., but I haven't seen it in my local auto parts. I suspect there is a reason Evans exists, so wouldn't be too creative. I buy Evans on ebay ($42/gal). Slowly converting all my vehicles to Evans. I recently did my wife's T&C minivan which has rear heat, so more involved. I also changed all rubber hoses to silicone. I always flush well w/ citric acid and pull the block plugs. Several episodes of Wheeler Dealers showed Ed China installing waterless coolant (didn't name the brand). Jay Leno swears by it in his fleet, especially hs older vehicles w/ rare cooling parts to protect. In my 300D's, my goal is to never have to pull the heater cores (very hard & expensive).

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans