Is there any amount of water (just H2O, not including impurities) that could add up to having 1 calorie?

Question

I'd be interested in hearing what difference minerals and impurities would have on this answer too, but is there any amount of water (even if we couldn't drink the amount) that would ever add up to having 1 nutritional calorie?

Answer 1

No. there is nothing in water that has caloric value.  Minerals do not have caloric value. Look at a vitamin jar. They have no calories