Steam-propelled spacecraft. I fully approve. However, this would likely not be especially cost-effective if we have to pull all the water into orbit from earth

Steam-propelled spacecraft. I fully approve. However, this would likely not be especially cost-effective if we have to pull all the water into orbit from earth; while the article mentions mining water from asteroids or moons, it puts that in a hypothetical future, even more so than using water as reaction mass, with refueling in low-Earth orbit proposed.