Alternatively, try setting out a bucket and collecting rainwater away from a place that gets roof run off. Most carnivorous plants require a relatively high humidity of between 50 - 90 percent. This makes a terrarium an excellent place to grow carnivorous plants. Even when growing nepenthes, it is still not a good idea to seal the terrarium because high humidity and still air also make the perfect place for fungus to grow - and fungus can wipe out a colony of carnivorous plants with devastating speed. Some carnivorous plants will also do very well on a window sill, like the American pitcher plants, which in my opinion are a great starter plant for a beginner.
Most carnivorous plants require bright light or almost full sun.
If you are keeping them in a terrarium you should use several cool white fluorescent bulbs - never use incandescent bulbs because they throw off way too much heat for your plants. Some carnivorous plants need a period during which they can go dormant. Most will just stop growing for several months, others will die back to nothing but underground tubers and roots. Some people make the mistake of throwing them out when this happens because they think their plants have died. To find out if your plant needs a dormancy period look under the Specific Growing Instructions on the main page of this web page.