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They're not getting enough water. The leaves are wrinkled and not shiny. In bark that size you could water almost every day and it wouldn't be too much. People warn about watering these too much, but if there's plenty of air at the roots, they can stay moist.
The brown tip also might be from touching cold window glass on a cold night. Plants can freeze that way.
Tap water is fine for hybrid Phalaenopsis like these, especially NYC tap water, which is quite pure. Bottled water won't help. Pipes don't alter water quality very much. Your other plants probably have a different problem than water quality.
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