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I am a veteran Twitter hater -- a "twater" in the cutesy Twitter mode.
And at least one reason for this is that Oscar has never interacted with twater, and Twin-Oscar has never interacted with water.
Intuitively, it seems that the inhabitants of Earth in 1750 would have beliefs about water and no beliefs about twater, while the inhabitants of Twin Earth would have beliefs about twater and no beliefs about water.
"T.ey all seem to be addressed to J.T. Fargo, Esq.," says T.twater.
(or ˜twater™ as it is sometimes called) is superficially just like the water of planet earth, the difference is that at the microphysical level it is made out of XYZ, and not hydrogen and oxygen.