The current scientific consensus suggests that the Moon did not possess liquid water or a substantial atmosphere before it was captured by Earth's gravity. The most widely accepted theory for the formation of the Moon is the Giant Impact Hypothesis, which proposes that a Mars-sized object collided with Earth early in its history. This impact ejected material from both bodies into space, and the debris eventually coalesced to form the Moon.
According to this hypothesis, the Moon's formation was a violent process that involved intense heat and the vaporization of any pre-existing water or atmosphere that might have been present. The temperatures generated by the impact would have been high enough to prevent liquid water from existing on the Moon's surface.
Additionally, the Moon's weak gravity and lack of a significant magnetic field would have made it difficult for the Moon to retain a substantial atmosphere over long periods. Any gases that were present would have likely escaped into space due to the Moon's low escape velocity.
However, it's worth noting that recent scientific research continues to explore the possibility of small amounts of water and volatile compounds existing on the Moon's surface, mainly in the form of ice in permanently shadowed craters near the lunar poles. These discoveries have been made through the analysis of data from lunar missions, such as the Lunar Reconnaissance Orbiter and the LCROSS mission. Nevertheless, these findings do not suggest the Moon had a previous atmosphere or extensive liquid water oceans before its formation.