Squirt a small amount...say 2 tablespoons of very warm water into the bottom of the incubator and your humidity will begin to some up immediately. I fixed my water container with a piece of tubing that comes through the incubator wall. I can add...or for that matter, subtract, water as needed. I used a syringe but you could use a basting syringe or an ear syringe...even one of those blue baby syringes for mucous when they are first born. If the humidity goes too high, I suck out most of the water until it starts to go down, then just add a little bit of warm...not hot...water.