The bottled water that goes on the bottom of the incubator is for heat capacity, not humidity. The water you mix with the vermiculite in the egg tub is what boosts the humidity.
The bottled water is there to stop heat spikes from happening. It takes a long time to heat up water, and a long time to cool it down. Water basically has a lot of "temperature inertia". So the temperature will be rock solid if you wrap your heat tape around a few liters of water bottles and then tape the heat probe to the bottles.
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