I could only feed it water these past two days, its eaten a little bit of egg yolk and a little bit of watery food.
Chick starter is probably the best thing for it right now.
Watery was a good idea, if that's the only way to get it into the chick.
I would leave a dish of dry chick starter available to the chick too, in hopes that it will start eating for itself. (And a dish of water, of course.)
Sometimes chickens like their food as a thick mush (wet, but not really runny), so that's another way you could try it.