Your instincts are correct: Nepenthes secrete their own digestive fluids (except N. ampullaria). Instructions to fill pitchers ⅓ with distilled water exist solely to prolong pitcher appearance for retail display—marketing, not horticulture.
Adding water causes no harm but serves no purpose. You may lose existing pitchers during acclimation, but new summer growth will be perfectly adapted to your conditions.
Jeff Dallas, Sarracenia Northwest
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