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Water spray is good, when I had orchids more than ten years ago (I was recently thinking of doing it again soon, they are so beautiful) I misted them every day since they like warm, humid air but not constantly wet soil. I had them in a glass window box facing southeast and they did very well. With the gravel filled tray under the pots, you can keep a very shallow layer of water down there just barely touching the bottom of the flower pot so the soil can wick up some moisture but the roots are not too wet.
I suggest googling to find more indepth info on soil and plant food; I know at our garden center they have packaged soil specifically for plants like orchids, as well as orchid food.
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