Heat it to room temperature, squeeze it to a pressure of 1 atmosphere, and the ice should just melt and run out the bottom. Or just heat it until the water sub

Heat it to room temperature, squeeze it to a pressure of 1 atmosphere, and the ice should just melt and run out the bottom. Or just heat it until the water sublimates, then collect the vapour and cool back down to liquid/solid. I guess it depends on your constraints vis a vis time, energy and amount of equipment you want to bring to the moon. It doesn't sound too tricky, but the main part is that you have to bring the dirt "indoors".