I did something silly at the last feeding - my BP was very keen for her rat and came out her hot hide and passed over the water dish to get to where I was offering the rat. She struck and pulled the rat back in - she swallowed in the water bowl and at once point her whole head and the rat were underwater! I panicked but about 20 seconds later she readjusted to lift her head.
I've seen my girl decide to bathe in her water dish once, but the humidity was spot on and it caused me to get a magnifying glass out to check for mites - none on her and none in the water. So I just put it down to a random thing she decided to do once.
But, as others have said - forcing them to soak isn't the done thing.