Yes there is indeed water on the moon. As to sampling we only did a small amount of sampling, but with laser spectrography I'm sure we could vape a small portion of the surface and do some surface testing.
The moon is partially hollow due to the lava tubes and so on, but as for actually hollow like a shell, doubtful.
Technically everything is hollow. Atoms are mostly empty space. Thanks for taking the time to read and comment. Much love.<3