Probably a bit late now, I got back from my vacation just over a week ago and I'm still catching up reading OB.
Anyway, for potted phals, dendrobiums, paphs, oncs etc I just water the day I leave, then any in the window I put on a table in the middle of the room so that while they are getting light they are not in bright sunshine. If I'm only away a week I leave them where they are unless they are already struggling.
Mounted plants is more of a problem. This time I watered them well a couple of times the day before, then laid them in the bottom of the bath with the plug in and a tiny bit of water around the plug hole (not touching the plants or mounts). This gave both lower light (still some light) and I hopped it would keep humidity in the bath so they dried slower. Seemed to work, they were needing a drink when I got back, but perked up well and look fine again now.
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