Pour in water and add pork back in. Cover & bring to a rolling bowl, then reduce to medium-low. Simmer for about 1 ½ - 2 hours, or until fork tender & cooked through.
Taste the sinigang broth - if you'd like it to be sourer, add more sinigang seasoning. If it needs more salt, add more fish sauce. Serve with steamy hot rice. Enjoy!