Yeah, the little guy's either an Alexandrine or a rose-ringed parakeet...probably. Man, I couldn't find any hand rearing recipes! Anyways, I'd get him some organic barley, buckwheat, oats, brown rice, and quinoa, put some in a pot after thoroughly rinsing the grains, and then add some water to cook it. You want them to become soft. Before feeding it to the little guy, I'd make sure it's cool enough to put against your eyelid. You want the food to be warm, but the mouths of birds burn very easily.
I'd also buy him organic baby food (the ones with different fruits and veggies—no added salt, sugar, or preservatives!). I'd also buy some organic peas, carrots, sweet potatoes, broccoli, Swiss chard, etc. (make sure to check online to see if the veggies you buy are safe for parrots). I'd wash the veggies with soap and water, thoroughly rinse them, steam them, let them cool, then cut them into little pieces for him. I'd also buy him Totally Organic Pellets and Goldenfeast's Golden'obles II. I'd probably just buy those online.
Is it fair to assume you'll be keeping him? In the wild, he'd probably (maybe?) be with his parents still. His feathers have come in nicely, so at least you're not dealing with an exceptionally young individual. He'll probably be learning to fly soon, so you'll have to practice flying with him (indoors!). You'll also have to show him how to eat different foods, and how to play with toys and stuff.
Bill is the wrong shape for an Amazon, so beyond that I would be guessing. So, based on that disclaimer it looks like one of those Conures.
