My other carmivores, the Pinguiculas can take our tap water and grows well indoors..but for sure this Nepenthes will be using distilled water, similar to what my Sarracenias get, though the Sarracenias need to sit in water..the seller of this Nepenthes said for this type it does not need to sit in water.. I just hope it still does not get too dried up here, when we enter our very hot low humidity periods in late Spring to Summer. This would be another fun learning curve