i don't think there is a way to make water into a sphere without serious gravity researching.
In zero gravity, water tends to form bubbles, due to surface tension or something like that.
Not like perfect spheres, but close.
And there's no point, really. The point of this is to prove that you can turn a sphere inside out without creasing. Sure, it uses a hypothetical material that can't exist unless its electrons parted when they come close to each other, but it does work. It just has no real world applications.