Remember, a chick that has absorbed its yolk normally can live on that nutrition for at least 48 hours. To treat wry neck, I offer a vitamin supplement (like Poultry Nutri-Drench) by wetting a cotton swab and just touching the end of it to the chick's beak. In cases where deficiency is the cause of the issue, I've usually seen improvement within 48 hours.
If he hatched yesterday, he may just be very weak. If he's still in the incubator, placing him something like a paper towel-lined cup may help keep him upright until he's stronger.
Best of luck!