He'll need at least 50mL a day Suziequeue, or more if his crop will take it. We give by syringe with their neck upright so the water runs down and away from the airways in the upper beak and under the tongue. Don't worry so much about eating at this stage, but it will help to get some soft balls of ground pellets down his neck as well to just feed the gut flora and keep them alive. Dehydration is the biggest problem so the water is very important.