Hydrogen and Oxygen are either identical or quite similar across Narratives, and bodies are shown to be adaptable with variant Oxygen, so it's highly likely that people could handle H2O from another Narrative with a little exposure.
"Do they have water? Oxygen?"
"Their hydrogen is identical to ours. Their oxygen is similar enough
to give them water. We don't know whether we could breathe it.
Carbon seems to be a little different. The metals and so on show
And we later learn that, yes, the oxygen is compatible:
She shrugged. "Hemoglobin is a classy molecule. Finely tuned to what
it does - take oxygen from the lungs and get it to every cell in the
body. If you give it oxygen that is only a little bit different from
what it's used to, well, it still works - just not as well. It's like
being at high altitude. You get short of breath, woozy, can't think
"...but wait a second, Jules can get along just fine on Arbre air."
"You acclimatize. Your body responds by generating more red blood
cells. After a week or two, you can handle it..."
As for other gases, the comment about Carbon and the metals might suggest that gases are more similar across Narratives than solid elements, but there's no data to support or disprove that theory.