Just to note something - Oxygen is fairly abundant on the moon (many rocks are oxides), hydrogen less so. Water is H20 by composition, but since Oxygen atoms a

Just to note something - Oxygen is fairly abundant on the moon (many rocks are oxides), hydrogen less so. Water is H20 by composition, but since Oxygen atoms are at least 8 times heavier than Hydrogen (and usually about 16 times due to neutrons), the Hydrogen is only 11% of the water by weight. Hence per Kg it's far more efficient to split the water into hydrogen, and re-oxidise it with native lunar Oxy; 1kg shipped water could be 1kg Hydrogen that would produce 9Kgs water once oxidised (ignoring difficulties in Hydrogen containment).