I believe they are potted in a thin clear plastic pot then slided into those decorative pots, right?
I buy these every now and then. It's hard to resist the urge when I see nice cute plants at a store.
Well, since you can see how dry the moss is through the clear plastic pot. it is rather easy to monitor the moisture level. just keep them on the drier side to be safe and when it looks almost all dry (you can safely guess by lifting the pot and feel the weight of it) mist heavily on the top of the mix until the moss is moist enough not not dripping wet.
Once the weather warms up considerably, you may water until the moss is completely wet each time you water as the moss dries out fast enough on these small pots during the hot season.
Yours look bigger than teacup phals though.
I normally keep these smaller phals in 3-4 inch pots.
I keep truly small teacup phals in 2-3 pots.
Well, I have one very small mini phal with lots of long roots and that one will go into much bigger pot to accomodate the roots.
Happy growing!