Cold Spiritual Water was very useful even to immortal cultivators in the Primordial Soul Realm. It was much less useful to regular warriors, and so it was a waste to give it to them.
However, Mo Qingtian did not believe that. Mo Wen had so much talent and potential that he, even as a warrior, had the right to use the Cold Spiritual Water. Furthermore, the water belonged to Old Man Ku Ji. It would be a waste not to take it.
While the Fire Leaving Stone was about the same price as the Cold Spiritual Water, the stone would definitely be more important to Old Man Ki Ji because he needed it to change his current situation.
A flash of light appeared in Mo Wen's eyes. He looked at Old Man Ku Ji with bright eyes and said, "Senior Ku Ji, if you are willing to exchange the Cold Spiritual Water for the Fire Leaving Stone, I am willing to go to the Path of Creation to find the stone."