I dont put alot of water in the incubator. For example, my walkin incubator is the size of a walk in closet. I only put a 1 gallon bucket half filled in their just to give some humidity in the air. The egg boxes with wet vermiculate will proveide good humidity to the eggs. Now you want to add moisture to the vermiculate over time if it starts drying out. I spritz my eggs once a week with a water bottle that i keep in the incubator. This is something i have always done, some may say thats not good to do others will agree but it is what i do and it works for me