How much blood do you have to drink so everyone will stop chasing you in Skyrim?

Answer 1

When you get into the level four stage of vampirism, everyone who sees you will attack you. All you need to do is wait until midnight ingame, sneak into someones house and drink their blood while they're sleeping. You only need to do this once to have your stage go back to level 1. It is set on something like a timer so you will have to feed every few days to keep everyone nice to you.