For the chicken, slice into 1 - 2 inch pieces, roughly ¼ in thick. Slice across the grain. Add the chicken to a bowl and combine with water and soy sauce. Let sit for 10 minutes until most of the liquid is absorbed.
Add the vegetable oil and cornstarch, and stir to combine. Let sit for 20 minutes.
Place your wok over high heat andonce hot, add a couple tablespoons of vegetable oil. Add the chicken in one layer and sear for 20 seconds. Cook until chicken is opaque, remove, and set aside.
Combine all the sauce ingredients in a bowl. Set aside.
Saute your vegetables on medium high heat until softened. Next, add half of the sauce and chicken. Cook for a minute and then add your noodles and remaining sauce.