My Nepenthes went through a little bit of a rough patch and doesn't have any pitchers right now. It's growing pretty well now, the pitcher formation is just taking a little while. The leaves are looking a little yellow and have a few little spots of necrosis. I would assume this is caused by a mineral deficiency. Since there's no traps I can't really give it any insects. How would I go about getting it some minerals? I've read that Neps are more tolerant of hard water than other CPs, would giving it some tap water help? Also, do I need to move it in for the winter or will it be ok to leave it outside?