Never heard of the practice, but I guess anything done under the moon can be charged to a great potential.
I used to regularly make moonwater but after awhile it began turning me into a night owl (energy levels rising after 10pm). Alas, that was counter-productive to my lifestyle and I balanced it out with sunwater.
Nowadays the moon is mostly an object of adoration for me. I just observe it or have dinner in it's light.