You will just have to put some water in the tray if you don't have a bucket. Be careful during incubation the humidity isn't too high because when the chicks pip the air sack in the shell they can drown from condensation that can build up in it. My cabinet is an older one but the principle is the same. Depending on the humidity you if you don't have the sponges for the tray a large cello sponge will work. My humidity tends to run high so I either put aluminum foil or a license plate to cover most of the tray.
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