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I use this brand or I make my own. As for as the amount to use, I just inject until the meat swells up. Usually a couple of ounces in each breast and and ounce or so in the legs and thighs.
That's what is good about injections. You can use anything you like. Here is a recipe i use.
2 tablespoons kosher salt
1 tablespoon mustard powder
1 tablespoon paprika
1 tablespoon lemon pepper
1 teaspoon hot sauce
2 teaspoon garlic powder
2 teaspoon onion powder
2 teaspoon white pepper. You can use black pepper if you do not have white pepper
2 teaspoon cayenne or any other pepper. I use chipotle powder
1 cup melted butter (unsalted kind)
At this point, add any other spice you like. Since you are in Thialand, use spices that is native to your country.
Mix together and inject in breast, legs and thighs. If you have any left, rub on the outside of the bird before applying your rub.