Never worry about asking too many questions, that's how you learn!
The URI and fleas should be treated pretty easily, so no worries there. When my kitten was found, he was covered in super-mutant fleas (lol).
According to my vet, a kitten should be drinking about 1/3 cup of water a day. Do you know how to check for dehydration? Just in case, you pinch the skin, pull it up and let go. It should snap back immediately. If it's slow, it means he's dehydrated. If this is the case, you can give him some Pedialyte through an eye dropper or see if he'll drink it out of a bowl. If he is hydrated, then you shouldn't worry.
However, if I were you, I would go ahead and give him some water through an eye-dropper, but be very careful not to tilt his head back so he breathes in any water. Make sure he is "drinking" it along with the pressure you are applying to the dropper.