Not sure how much Can a Force-user split an atom with the Force? answers my question, maybe only partially.
I don't really mean creating matter out of thin air, but inducing chemical reactions? If you can move stuff with the Force, and if you can effect the biochemical state of an organic's mind to think different things, then, in theory, is a Force user capable of synthesizing water from hydrogen and oxygen by just smashing them together hard enough?
If I recall correctly, the Star Forge used the dark side to build a great manner of things, so I would imagine the natural Force, theoretically being greater than the full power of the dark side, would be capable of similar stuff.
Not just at the atomic, but also at a larger scale: Given enough effort, time and unlimited access to the Force, can a Force user theoretically construct a star system out of a nebula?
Can Force users play god? Or is it
That's not how the Force works!
Edit: Let's not forget lightsaber crystals can be synthesized. Although I don't know the specifics, it does seem to be an example affirming my question.