Saigon Noodle Salad Dressing: ¼ cup water, or more to taste 3 Tbsp. lime juice 3 Tbsp. fish sauce 3 Tbsp. brown sugar, or more to taste 1 clove garlic, minced 1 tsp. minced fresh ginger root ½ tsp. Sriracha chile sauce Salad: 1 (8 ounce) package (linguine-width) rice noodles 2 cups thinly sliced Napa