"We have water inside us", which I wrote, is idiomatically correct English and should be considered correct. It is, in my humble opinion, a good equivalent rendering of the original sentence in Hebrew. Don't you agree?
"We have" would be "יש לנו" It basically means the same, but it's not the translation of the sentence.
Not at all, we consist 60% of water: https://www.nestle-waters.com/healthy-hydration/water-body
Yes but if i weigh 99lbs and drink enough water to go up to 100lbs, am i now 61% water????? '(x_x)/'