Add the chicken pieces to the larger bowl and toss the chicken around so that each piece is coated in the mixture. Let it sit and marinate for about 10 minutes.
In a large bowl mix together 2 tbsp of the olive oil, the oyster sauce, garlic and ginger paste, soy sauce, rice wine vinegar and salt and pepper. Take half of the mixture and pour into a smaller bowl. Add the water to the smaller bowl, mix and set aside.