It's hard to water bare-root Vandas enough with our humidity. I use a sprinkler head on my irrigation clock. Yes you can use less fertilizer if you use it more frequently. I would not save dunking/soaking water from one day to the next. We have nice warm temperatures that would help severely destructive water molds grow. Motes plants are grown touching each other. I do use the same dunking water for all my bare-root Vandas from Motes.
__________________ May the bridges I've burned light my way.