I have one - is this the plant you're talking about? (click on the photo to make it big) It's necessary to make sure there is always a little bit of water inside the pitchers or they do shrivel up especially in hot weather. You can see the tops of some of mine are doing that. This plant gets a little early morning sun but is in shade the rest of the day.
I spray this plant with rainwater every day. I just keep a spray bottle next to it and give it a good wetting when I walk by. They don't like chlorinated tap water, and distilled water doesn't have any nutrients at all in it. The plants do get most of their nutrients from 'eating' bugs digested in the pitchers, but they also get drip water from trees in their natural environment. So they respond pretty well to a tiny amount of soluble fertilizer in the spray water, too. I have orchids so I just spray it with my orchid fert once in a while. Compost tea, very weak, would work well, as would alfalfa tea (made from alfalfa pellets).
Of course here in FL there are lots of bugs for it to eat, too. If you have it indoors, there may not be enough bugs! Feed it some fert then! Not on the soil as you would a regular plant, but in the spray water so it absorbs the nutrients through the leaves and pitchers. Very weak!
