The Cape Sundew lives in arid South Africa, and I heard that it can go long spells without watering.
Drosera Binata, the fork-leaved Sundew, supposedly can survive long spells without watering too.
I have heard that D. Brevifola does OK under those conditions too.
So what are the Sundews that survive best without long watering and don't care about humidity? I would keep the plant indoors with the lid off for a week or two at a time, or outside, where there is just regular South Carolina humidity, that is, maybe 50% humidity or so. It's not desert, but it's not wetlands either.