I grew a variety of CP outdoors in Arizona. The pots were set in about an
inch of water. Many of the low-growing CP did quite well, especially
"bland-rosette" style Drosera.
I tried a few Nepenthes under this growing strategy. They grew very slowly
and did not pitcher, but they lived.
My experience indicates to me that the humidity requirements of many CP are
overestimated, but Nepenthes are one of the more humidity-demanding genera.
Fortunately many Nepenthes (check out the lowland spp.) can tolerate a great
deal of heat. So you can keep them in a humid confined tank even where the
heat may threaten N. American CP spp.
Michael