Old Wineskins and New Wine

Why were the pharisees critical about our LORD not teaching His disciples to pray and fast? Why did the pharisees bring John the Baptist into their discussion on prayer and fasting? How did the LORD explain why He didn't teach His disciples in the tactics of prayer and fasting as did the pharisees with their own? What is the connection between Christ's statements on prayer and fasting and old and new garments and wineskins?