Demineralized water is specially purified water that has had most or all of its mineral and salt ions removed, such as Calcium, Magnesium, Sodium, Chloride, Sulphate, Nitrate and Bicarbonate. It is also known as Deionized water, DI or Demin water.
This will help remove all the excess electrons from sustained Magnetic Field Poisoning, incorrectly labeled Long Covid.
Limit use to 1.5L a day, with meals. I would not use store bought in leaching plastic jugs. I use a distiller, and distill daily.
Still try to drink something with minerals in between meals, but avoid alkaline water/diet.