Distilled water is indeed pure Water--but it's pH may not be rate around 7 on the pH scale.

Pure spring water(s) will be replete with minerals [mostly & ideally all alkaline mineral --not to be confused with natural carbonated water(s)].

Of Course Distilled & Filtered waters are not toxic--but the real benefit is the flushing action of water is the basic hydration of the body.

Water must contain naturally occuring minerals or else it may be considered sterile and thus cause acidity within the body--which is the state of all illnesses.