We can answer a question that you may not have realized needed to be asked: what's the difference between water of life and normal water? Is there a chemical difference, or is this intended as a metaphor?
Water of Life
A Pure River of the Water of Life
If we're going to live with the Lord God who's going to reign forever and ever, and a pure river of the water of life is flowing, then it must be cycling because God isn't going to constantly create new water forever.