breastfeeding and mothers diet

There is much information about breastfeeding and a mother's diet. What is the truth? Do nursing Moms have to eat a special diet, what foods do they need to avoid, if any? What about caffeine and food additives?

• foods to avoid while breastfeeding
  Are there certain foods that moms should avoid while breastfeeding?
  
  
• breastfeeding and caffeine
  You stopped drinking caffeine when you got pregnant, it is still off limits now that you're breastfeeding?
  
  
• how much water do I need to drink while breastfeeding?
  Is there a certain amount of water I must drink while breastfeeding in order to make plenty of milk for my baby?