Screwdriver
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Simple, 3D print everything using the lunar soil covering the Moon regolith...
That is in fact a viable solution to moon based construction and one that I have seen discussed in depth before. There is plenty of water on the moon of course, locked up in ice typically in deeper craters (or caves??).
<edit> Here you go: https://www.planetary.org/articles/water-on-the-moon-guide