Cook pork roast 3 hours at 325*. Cool. Shred meat, discarding any fat. Place shredded meat, taco seasoning, water and green chilies in a large saucepan and simmer over low heat for 2 hours.
When ready to serve, steam tortillas to soften. Place a generous portion of shredded pork mixture on each tortilla and fold over. May be served with refried beans, guacamole, shredded lettus, shredded cheese, sour cream, Pico de Gallo, picante sauce, or any other garnish of your choice.