I'm so glad you clarified the "ate cooking" part...I was thinking you must be hungry & your subconscious mind did the typing.There are NO recipes here for BP-stew!
As others said, you'll have to tweak ANY enclosure as seasons change. A larger water bowl CAN improve humidity IF it's partly over UTH heat.Many of my snakes
LOVE their 'humid-hides' -filled with sphagnum moss (soaked & mostly squeezed out before using). Even if not shedding, it feels natural to them.
Your animal won't be breathing out enough humid air to impact the reading in the cage. As far as "purified" water versus tap, purified will reduce the water spots* left by
the minerals in the water, but honestly I use tap water anyway. (our local water tests pretty clean & safe) I do remember reading that you should never use "distilled"
water for herps though, they need the trace minerals & distilled can mess them up somehow. (*& an effective mildly-germicidal thing to wipe down a cage with is white
vinegar, which will get rid of hard water deposits anyway. I especially use it in water bowls...& obviously you do need to rinse it.)
Congratulations on your new ball python!