Option 1: Freeze - This option is incorrect. In the vacuum of space, the absence of air pressure would cause the water to boil, not freeze.

Option 2: Boil - This option is correct. In the low-pressure environment of the Moon, the water would experience a rapid decrease in pressure, causing it to boil at a lower temperature than at room temperature on Earth. Therefore, when the lid of the bottle is opened, the water would immediately start to boil.

Option 3: Decompose into oxygen and hydrogen - This option is incorrect. Water does not spontaneously decompose into oxygen and hydrogen. It requires a chemical reaction, such as electrolysis, to break down water into its constituent elements.

Option 4: Not change at all - This option is incorrect. The change in pressure on the Moon would cause the water to boil. Therefore, the water would not remain unchanged when the lid is opened.

In conclusion, when the lid of the bottle containing water is opened on the Moon, the water would boil due to the lower pressure environment.