I've been adding water to the incubator using a plastic tube and a syringe. It only takes half a syringe full twice a day to keep it where I want it. If I add hot water, the temp in the incubator spikes up several degrees for 30 minutes or so. If I use ambient temp water (about 75 degrees), the temp in the incubator stays stable or drops part of a degree -- from 100 to 99. I'm not to lockdown yet (Tuesday), and at that point I'll use water as close to 100 degrees as possible since I'll need lots more of it. Here in KS it doesn't take much water to keep it at 30% (my egg supplier's recommendation), but pumping it up to 60% or so will take more water.
This whole humidity/adding water thing is very challenging.
Sorry about your turkeys, but sometimes when things are just too hard to do, a person needs to rethink the whole idea.