If there was water anywhere on the moon that received sunlight, the sun would melt any ice. Because the moon has no air, the water would evaporate right away. Since the moon's gravity is not very strong, it would not be able to hold onto the water vapor, which would float off into space. At the moon's poles, however, there are craters where the sun never shines. Here, any water could stay frozen as ice and remain on the moon.
Some scientists think that there is enough water on the moon to fill an entire lake.
Many scientists think there may only be enough water to fill a small pond. And some think that there is no water at all, but that the hydrogen is part of some other chemical. If there is water on the moon, it might be useful for astronauts who want to make a moon base. Then they would not have to bring water with them from Earth. I hope this answers your question.