7qt tub ~ I prefer locking lid sterilites
light diffuser panel ~ covering the bottom sitting lightly on the perlite.
perlite ~ 2 inches deep
2 tiny holes place on the long end of the tub towards the top, to allow the tub to breath.
I never have a need to open or air out the eggs during the whole process.

In the incubator the water bottles down below only hold temperatures up or help keep them up, they don't provide any humidity, that's the tub's job.

A proportional thermostat will be your best friend, if you can't afford one using an on/off thermostat will work, but you'll be constantly adjusting it.

You'll also find you don't need a fan in an incubator if you're only using one shelf.