Carnivorous plant enthusiast
There is a drip irrigation system that is available and many people with greenhouses use it. I would suggest that. 3 weeks is a long time. I have been away on vacations 2 times in the past 2 y and the first time, I lost irreplacable nepenthes seeedlings that I still regret. The second time however, I managed to get all of them to successfully make it. I basically put all of the pots in bags in the tank and just keep the regular system of misting 7times every day and the plants did fine for a week.
Be careful if you think about turning lights off and keeping it damp. I did that and my tenuis almost died. Too much of any variable (especially humidity/water) can cause big problems if you do not have others in sufficient quantity (light + air).
Oh, the humanity!!
Ooh, definitely not turning lights/fans off. That'll keep running... not too worried about the electric bill
Even if I can get the plants through two weeks of solid watering and have them get a wee bit thirsty over the course of the third week, I'll take it. I've been mean to my plants over the past few months and have watered my Neps as infrequently as once a week, and they don't seem to upset about it (of course, I know I'm playing with fire there)