You can find the mineral content on page 17 and some more for total hardness and alkalinity. Distilled is just wet, the spring water is almost RO. Use what is cheapest.
https://eservice.ozarkawater.com/Documents/oz_BrandWaterQualityReport.pdf
Distilled is usually just a bit more expensive, but not by too much. Thanks for that website! My IPA recipe calls for adding gypsum to the boil. Would you still recommend one over the other, or a mix of both per the following info......
{referring to pages 17 & 18}:
Natural Spring:Calcium = Not detected
Sulfate = 1.4 - 5.7 ppm
Sodium = 2.4 - 11.2 ppm
Alkalinity = Not detected - 9.2 ppm
Hardness, Calcium = 5.6 - 8.6 ppm
pH (units) = 5.6 - 6.3 ppm
Distilled:Calcium = Not detected
Sulfate = Not detected
Sodium = Not detected
Alkalinity = Not detected
Hardness, Calcium = Not detected
pH (units) = 5.7 - 6.2
*Natural spring water also contained: Barium, Bicarbonate, Bromide, Chloride, Fluoride, Magnesium, Nitrate, & Potassium