How to pronounce “rain water” in English

below this is where we capture their rain water this is some of the solar and now imagine this is a building called

And what was so beautiful is that the birds would open their mouth and drink the rain water as it fell.

than we know what to do with, but the very few harvesting almost all of that rain water?

It says, "so much depends upon a red wheelbarrow, glazed with rain water, beside the white chickens."