Yes of course, it is ridiculous not too. While BP's get most of the water they need from the rodents they eat that doesn't mean that they don't need access to fresh water.
I see all of my BP's drink from their water dish on a regular basis
If a BP is on a feeding strike their only source of water is a water dish in the cage. They will die of dehydration long before they do of hunger.
A water dish will help humidify the cage, and provide a place where they can cool down if necessary. Further changing/refilling the water dishes on a regular basis is a good way to make sure your snake is healthy and your cage/heating system is functioning properly. There is absolutely no good reason not to have a water dish in the cage.
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