Nepenthes like being kept moist, not wet. Think of a moist sponge. They appreciate a well draining potting mix and dislike standing in water constantly. They should never be allowed to completely dry out. You can keep them in saucers of water indoors, but they must be allowed to evaporate in between waterings.
Nepenthes like to remain moist but not flooded. This is best accomplished by top watering them 2-3 times per week. The shallow tray method can be used when going out of town. Fill the tray with about 1” of water and then allow the tray to dry out for a couple days before refilling.
Just to give you info from some professional and reputable nepenthes growers!