I heard that keeping the water bowl over a heating pad that's underneath the cage would help disperse humidity, also. I'm just worried that'd make the water warm - or is that not an issue for snakes?

I'm also wary of heating pads, considering I had a friend who had one that caught on fire and it singed his snake. (Thankfully, the snake survived, but did suffer burns unfortunately). Are there heating pads with temperature controls or something? Or timers? How do heating pads work? I feel like a derp for not really knowing how they work, but I know heat rocks are a big no-no, and lamps dry the air out, so I feel like the heating pad is the best way to go, but I have some concerns about those too....

That's good to know about the foggers, though.
If I kept a humidifier in my room and kept it near the cage(s), would the small vent on the back of the Vision enclosure be enough to maintain the levels along with a few sprays with a water bottle? I need to get a humidifier anyway, considering I get bloody noses frequently due to the dry climate, so that would pretty much be a win-win.