Remember, I was talking about real water, intending to imply meaning inclusive of how Christ spoke of "water".
Feel free to let me know if you actually have something pertinent to the main thrusts of what else I was saying.
I am afraid you are not using a relevant definition to Natural Law as it applies to ethics (LINK)
In the context of ethics, Natural Law philosophy means judgments of right and wrong based on reason, because rationality is our nature. That's why it's called 'Natural' Law. Because it is law derived from human nature,. That is, a rational nature.
This would be as distinct from Supernatural law, which is, in itself, above our nature, and cannot be apprehended except by revelation.
Supernatural Law and Natural law, properly understood, will reach conclusions which do not contradict each other. They reach congruent conclusions by different routes.
It does not mean "doin' what comes naturally" or "that which is naturally obvious." It takes a whole lot of disciplined intellectual work to have a coherent grasp of Natural Law.
Natural Law relates to all those questions I asked you in #184. I don't think most of them have obvious answers from Scripture.
Do they?
They don't have smack-on-the-nose 'obvious' answers from 'nature', either, but you can reason them out. In fact, you have to, or you aren't acting justly.