The sure are adorable. I’d leave the food and water in with them usually after about 24 hrs they begin to get hungry. What are you using for their water? If you go on fist page of the duck forum on left side top before threads start you’ll see the sticky’s scroll down till you see raising and caring for ducklings there is a pic of a homemade waterer perfect for keeping them from getting into turning over or getting wet and chilling. You might still have to show them both food and water to get them started.