This article has several rebuttals written by different scholars and preachers which is taken from different websites. It clears every doubt about sun setting in murky water in Quran and Hadith and also explains the meaning behind sun’s prostration.
First rebuttal: Sun sets in the murky water as per Qur’an?
Second rebuttal: What does it mean that the “Sun runs on to its place of settlement?” When is this? How is this?
Third rebuttal: Unreliable Hadith about Sunset in the Spring of Warm Water
Sixth rebuttal: The correct way to describe the sun is that it “prostrates beneath the Throne” and not that it “sets in a spring of warm water”
Seventh rebuttal: Meaning of Prostration of the Sun under the Throne