Yes, that's perfect - increasing the liquid IF the crop empties too slow. I usually aim for the consistency of ketchup. Another thing you can feed is thawed frozen green peas if you want, popping them in his beak one by one or two by two ... But mainly stick with your formula.
Sounds like work...
I think you could feed it again now. I usually try for 2 feelings a day, am and pm, unless the crop is not emptying. I don't think it has to be completely empty between feelings.
So looking at the new fotos and age estimate I think you have a good chance of saving this one.
I meant feedings...
For some reason with my obsolete tablet I can't copy and paste a photo but if you want to click on my profile then images, on page 10 of images there is a foto of me hand feeding and a foto of the little bottle I use.
I'm puzzled why it took 3hours to feed him,or did I misunderstand?
I have always fed out of a small bottle with like a piece of balloon or latex glove placed over the top with a slit for baby to put his beak in. Usually took only a few minutes.
Yes it should be fine for handfeeding until weaning. I have used just the all flock pellets ground with water as the basis for my handfeeding. I also like to add a bit of peanut butter for flavor and some nutritional yeast but those are optional. Best of luck with the youngster!