Trim any large pieces of fat and cut the pork into 2" (5 cm) chunks.
Place the pork, water, orange juice, garlic and salt in a large, heavy pot over high heat.
Bring to a boil. Cover the pot, lower the heat and simmer for about 2 hours. Check occasionally to monitor the progress.
As it gets closer to the time test the meat by poking it with a knife. When the knife can be inserted without resistance the meat is done. Give it more time if necessary.
Add the brandy or rum and increase the heat to medium. Continue cooking, uncovered for another 15-20 minutes.
If any cooking liquid remains, turn the heat to high to boil it off.
Once the liquid has evaporated, turn the heat back to medium and continue cooking until some pieces of pork begin to crisp. Be careful at this point; the sugars in the orange juice will tend to burn. Stir the pork as it fries to prevent burning and also to break up the bigger pieces of meat.
Taste for seasoning but be warned - this stuff is addictive!