I did not say I would limit freshwater on Mars. The moon probably would not have it or if it did very rare. Colonization of other worlds is going to be much harder than colonizing another landmass like in the colonial era of the game.
In addition I imagine colonization working like this ...
1. Your city builds a launching pad or spaceport.
2. Your city sends out a probe or rover to scout out the terrain.
3. Your city sends out a colony pod which works like a settler. This would be specific to each map. So you could not settle a moon settler on mars or or earth, etc.
4. The new colony would have limited building choices which would expand as you sent more stuff to the colony.
5. Send more cargo ships which would give special buildings only buildable either by the cargoship unit or by a special colony building.
For instance you send a factory pod to the Moon so it can start manufacturing buildings and units of their own. This would be much easier to do than sending cargoships into space. And thus start them on a more sustainable colony.
I think we should try not to have references to freshwater on the moon
.
Some ice may be found underground or within the shadow of craters. But I agree that it would be extremely rare to find freshwater. No rivers on the Moon for example. However with terraforming things can change.
At any rate, for the Galactic Map I'd start with Final Frontier Plus. God-Empereor is a semi-regular on this forum, and would probably be willing to provide advice/resources on this front.
At the very least I would use the default Final Frontier mod that comes with the game. Any mods that add to that would be a great asset since less work for us.