The Laelias you bought are from a group of Laelias called "rupiculous." They grow mostly (if not all) on rocks and boulders, so the gravel potting mix is about standard for them. With them growing in gravel, it would be impossible to over-water them, so yes, I'd water them every day.
Since you just bought them, they will need time to adjust to your climate. Once they are adjusted, you should see new growth - sometimes it just takes a little while to see orchids come alive, so to speak.
Have fun growing them - they're a type of orchid I've always wanted to try, but for some reason or another I've never bought any.
-Tim
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