Comments of chapter undefined of A Contract with Vampire

Just wonderig what do the vampires eat for breakfast or dinner? shouldn't they drink blood? how do they get the blood if they are so many of them in their own district won't they starve? do they not need a lot of blod or did they find a scientific way to create a blood replacement? can they survive on normal food when they are turned? And how come there are only two pure blooded vampires left?🤔