I think I agree with you that distilled/ultrapure water wouldn't be harmful, but I think it would be okay only due to consuming electrolytes in food. I bet the

I think I agree with you that distilled/ultrapure water wouldn't be harmful, but I think it would be okay only due to consuming electrolytes in food. I bet the amount of salts/minerals you need in food increases if you only drink distilled water. And I bet if you fast and only drink distilled water, you would eventually get sick/die.