Moss or Bark

[Paerata]

I'm a novice who went to our local orchid show where I was told that the moss soil for a phalaenopsis I have was a bit of a weakness in that the retention of water it allows can be dangerous for the well being of the plant. I therefore bought bark at the show, replaced the moss and now find that the bark dries out so quickly that I'm watering twice a week instead of once. The orchid lost leaves before I realised this.
Would a combinatrion of the two- moss and bark be preferable?