Those wire mesh lids are hard to manage so definitely cover some of it up with saran wrap or something similar. As long as their some area open for air movement it will really help. Do you use any sort of overhead heat lamps? They are awful for sucking out a tanks humidity.

As far as the water bowl, it isn't particularily good for your snake to be in it so much. First make sure this snake doesn't have mites as that can cause them to soak excessively. Get the humidity up with covering the lid and perhaps adding in a second water dish on the warm side to encourage more evaporation in the tank, you can also add in some damp moss in a hide for your snake to use during shed cycles. I don't put a water dish in with any of our snakes that's big enough for them to climb into. They might drop a coil in there occasionally but they won't fit and they don't bother to try. That way they can't poop in there and foul their water or get belly rot from soaking too much.

It's okay to worry....shows you care and are striving to be a responsible owner.