If you're making this recipe with fish, cut it into bite size pieces. I used sunflower oil. You can use sesame oil (nallenna), corn oil etc; When you add vinegar, start with 1/2 cup and add more, after doing a taste check. Keep in mind that that it will take time for the flavor to settle in. This is a spicy recipe, please adjust the ingredient measurements to suit your taste.
If you are planning to keep it for a long time, it's better to refrigerate it. Also, if you're living in a hot & humid climate, refrigeration is strongly recommended. Though you can start using it the day it's made, it's better to keep it for 1-2 days for the flavor to settle in. Make sure that you use only boiled & cooled water.