I wouldn't worry about it, I very rarely see my bp drink, either. As long as your snake isn't dehydrated and you're keeping humidity up, there shouldn't be anything to worry about. If you're worried about your snake staying hydrated, you could always warm up their food in water and feed it to them still wet.
Also, there's a very good chance you just don't see your snake drink because of when ball pythons are active. The few times I've seen my bp drinking coincided with the times I happened to be up at 3 a.m.!
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