From https://www.who.int/water_sanitation_health/dwq/nutrientschap12.pdf
>HEALTH RISKS FROM DRINKING
DEMINERALISED WATER
>demineralised water is defined as water almost or completely free of
dissolved minerals as a result of distillation, deionization, membrane filtration (reverse osmosis or
nanofiltration), electrodialysis or other technology
>At one of the working meetings for preparation of guidelines for drinking water quality, the
World Health Organization (WHO) considered the issue of the desired or optimum mineral
composition of desalinated drinking water by focusing on the possible adverse health effects of
removing some substances that are naturally present in drinking water (2).
>“not only does completely demineralised water (distillate)
have unsatisfactory organoleptic properities, but it also has a definite adverse influence on the
animal and human organism”.
>Sufficient evidence is now available to confirm the health consequences from drinking
water deficient in calcium or magnesium. Many studies show that higher water magnesium is
related to decreased risks for CVD and especially for sudden death from CVD. This relationship
has been independently described in epidemiological studies with different study designs,
performed in different areas, different populations, and at different times. The consistent
epidemiological observations are supported by the data from autopsy, clinical, and animal studies.
Biological plausibility for a protective effect of magnesium is substantial, but the specificity is
less evident due to the multifactorial aetiology of CVD. In addition to an increased risk of sudden
death, it has been suggested that intake of water low in magnesium may be associated with a
higher risk of motor neuronal disease, pregnancy disorders (so-called preeclampsia), sudden death
in infants, and some types of cancer.

Don't even think about drinking distilled water, chud.