i do not water every day. most of my vandas have at least a small pot of bark (some are in treefern pots with moss and fern/bark mix) and get water on wednesdays and sundays, except in extreme weather, if it is cold, i skip watering until it is a warmer day, and if it is hot they get the aerial roots spritzed with a mister in the morning. the few i have in baskets with little to no medium get spritzed nearly every day in the morning. but at some point i will get around to potting them like the rest.