Because its all about the time of the first advent of Jesus and Jesus explained what the living water is.
No, it's about the second advent, when Jesus returns in judgment and restoration.
We can both make these kinds of statements, but what is the authority?
These are proposition prophetic narratives. This will happen, then that will happen, and so on. My authority is that is says what it says, it means what it says, and what it says harmonizes with the rest of the Bible.
Your assertion appears to be that it doesn't really mean what it says, what it says actually indicate different things, unsaid. On what basis should we say, "It's not REALLY a mountain splitting into two, forming a valley, half moving north, half moving south, through which the people will flee"?
It sounds like you've decided that this all must be related to Jesus' first advent, and now you are determining the real meanings of these words based on that idea.
On what do you base that idea, that this must be "first advent"?
There seems to me to be a lot of Scripture that connects this prophecy to others, which outline the same thing, Jesus coming to rescue His people who are about to be destroyed, then regathering them to their homeland, and judging the gentile nations.
I've selected this one in particular as it describes a narrative in clear terms. So I continue to ask, why shouldn't we accept the clarity of the passage?
Much love!