Couple of ideas. I have ducks not geese (you may want to move this question to the goose thread), but for several hours after hatching, perhaps up to 48 hours? Certainly the first 24, I believe that they "feed" on the absorbed yolk.
I would think having fresh lukewarm water would be most important, and then after a bit, they may show interest in food. But go check with the goose people about that.