Hi Lindsey, in my area, what worked for me was to make the containers sit always in standing water, and I only use distilled water. It is so dry here, it was by accident that I found out it worked better that way. While I was away my hubby poured way too much water and made the plants sit in water. I noticed the improvement, pitchers staying on colors better. Before that the pitchers where just drying out way too fast.
And Nepenthes likes good direct sun at times, so it enjoys our west facing window. I have them by my kitchen sink so it gets extra humidity from there too.
Do you know your indoor humidity levels? It helps to have a weather station that will measure both your outdoor and indoor temps and humidity levels. That way you can adjust your growing conditions as you deem necessary.