Lily, it sounds that you may have a peat-based medium, i.e. HP or some of the other trade names. It looks like soil but is peat moss and may contain small perlite or the like. People under very controlled conditions can grow some outstanding plants with this stuff, but I do not think it is ideal for more than a small subset of orchid growers. That peat stuff is extremely difficult to rewet when it becomes bone dry, and you'd be walking a fine line between moist and root rot anyway.
If this were my plant, I would get it out of that media ASAP. Under my conditions, leaving a plant in a peat medium would be a disaster waiting to happen. I would suggest sphagnum moss if you can find it, as the roots would easily be able to absorb the water they need if they are dehydrated. Make sure to pot loosely. If the plant is otherwise healthy, and you pot gently, it should be a minimal impact to the flowers. I don't want to push you into repotting, but that is my advice.