Not sure if your incubator has much humidity ... is the little one all dry ? As for food again I have never had geese but for my baby chickens I chop up cooked eggs a scrambled egg is good I just beat it and cook it not adding milk and butter. I also add in smalll parrot seed .... chiken chicks like to peck so I sprinkle some about on the groung. Maybe some egg-wash soaked bread... good using the chick as a temp guide. The recommend guide is good to know but watching the chick is best. Yes they need friends ... friends help them keep warm too. A stuffed toy would be better than nothing. The floor cant be smooth ... pine shaving seem popular, an old towle can work too.
The incubator has lots of humidity, that's one reason I hate to take the chick out into the dry, cool air. Right now it likes hiding behind the thermometer I have propped up inside the incubator. It seems really healthy and full of energy.
I guess it's as dry as it's going to get inside 70% humidity. The egg shells fell off its coat.
I put pine needles on the bottom. The cats and duck like laying on them. They're warm.
I found some chick starter feed that someone gave me a while back. It smells a bit stale, but after giving it a good stirring, it may be ok. Of course, I could try some cat food. The adults love cat and dog food.
I'll post some pics later today.