How do you adjust the pH of distilled water to pH 7?

Answer 1

By utilizing a standard pH meter or a standard pH test kit - you will first test the pH of the distilled water - then either add pH UP or pH DOWN (sold at pet stores and hydroponic garden stores) until you reach your desired pH level. A little of the pH adjustment solution can make a big difference so deliver the solution in drops, one drop at a time and then re-test.

Hope this helps!