Snake mites require a high relative humidity - over 75% - to thrive. Below that threshold the larvae have issues with molting and many end up dying due to dehydration.
http://denardo.lab.asu.edu/publicati...snakemites.pdf
I wouldn't give water bowls big enough so the snakes can soak, I'd aim for humidity of 55-60% in the enclosure to kill off the mites faster. You can give your snakes a bath once a day in some moderately warm (not hot) water with a drop or two of dish soap to help drown the mites on them and give them relief.
Also if you use any of the on-snake mite treatments like Reptile Relief or Frontline, if the snake soaks in its water bowl you don't want it drinking the chemical.
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