Moon's Graden

 Hi , I just joined this group because I have a new pit puppy. and I
dont know alot about this breed . im not a new dog owner I had my last
dog 11 years but he was already 6 monthes old when I got him my new
puppy is 12 weeks old heres my question. he was a rescue dog and was
pretty skinny and dehydrated when the guy I got him from got him , now
that I have him hes still a little slim im feeding him twice a day
just a lil over a cup at a time ? and all the water he wants. is this
enough food or to much? should I feed him less at a time? anything you
can tell me to help me and Gus would be great thanks.