John, I just use a straw through the vent hole and use a syringe to put water in it. If you are past day 18 you should not have your turner in there anymore. If it is before day 18, I just open the lid and pour water into the bator directly. I do have 1 row of the turner removed, so I have room to dump the water in there. I am also using the Genesis 1588. I am pretty new to this, this is only my 2nd hatch, but I would be happy to answer any questions I can.
Steffanie