I pour rain water over mine every day in the summer without really looking whether they need it or not. Mounts can dry fast and mine don't have masses of moss on them so they need it.
I used to use a spray bottle but give them a very heavy spray, they need more than just a light misting. Pouring water over is faster when I have plenty of rain water. If I'm running short on that I go back to spraying with water as it uses less.
In the winter I water less. Every other day is what I aim for, this winter they got more like once a week because I wasn't well but they survived even if looking a bit more wrinkled. They would cope with that rare a watering in the summer I don't think.
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