Most of the guides you see show some mixture of substrate that includes moisture in the recipe. I use vermiculite and water in equal parts by weight... actually I have been putting just a bit more water in recently. But you can also sprinkle water around the sides of the egg container if necessary.
The fan in the inc is going to kill humidity but I wouldnt get too wet with the original mixture so would probably lean towards the sprinkle method throughout incubation.
You can also keep an open container in the inc that you top off from time to time, or a humidity box, to keep the entire inc humidity up. Take a look at some DIY inc instructions they usually have some good ideas.
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