Diets can vary alot. Basically a well balanced/fresh and RAW diet should be fed. We never add CALCIUM in any form, it is not needed and can cause problems with correct bone growth.
Puppies up to 12 months of age are on a special diet - richer in protein, minerals and vitamins and they can have up to four feeds a day.
We like to feed our Bullies fresh, RAW chicken frames, wings, necks, turkey necks and meaty pork and beef bones. Brisket bones with the fat trimmed off and rabbit when I can get it.
Nice bones, nice meaty bones.  Never COOKED bones ! This is the basis of their feed.
Twice a week we like to feed them fresh RAW vegies & fruit ( beans, broccoli, cauliflower,  celery, peas, corn, carrots,  apples,  banana's etc. )  chopped up with a small amount of garlic and mix all of this up with a good quality mince. Rice or pasta, livers and hearts in small amounts can also be added. Fruit pulp from your juicer is  excellent to use. A food processor is best used for the vegies & fruit. Eggs can be added or fed boiled, they do like a hard boiled egg for a snack ! 
Potatoes, pumpkins, anything starchy must be cooked (they love pumpkin).
Big knuckle bones are good for a chew, cleans their teeth and they contain marrow.
We also give our Bullies milk ! As a treat, add an egg, they love it and it must be beneficial to them. 
For snacks they get banana's, apples, oranges, any type of fruits that are available. Cheese is another favourite, shredded over their meal !
Additives are not necessary, but I do like a product called Keylomin Organic which is a multi vitamin.  A spoonful of this can be added occassionaly sprinkled over their  mince.
We do like to use a PREMIUM quality dry food (we use Eukanuba and Hills) a couple of times a week,  this is where I add sardines.
Table scraps are given, honey on toast and especially vegemite or marmite on toast is good as they contain B vitamins.
Always have cool fresh water available !
Chocolate and onion should not be fed as it is toxic to them.