4 cups water 3 cups fresh spinach leaves 1/2 pound snow peas, trimmed and cut in half crosswise 1 (5 3/4-ounce) package pad thai noodles (wide rice stick noodles) 1 tablespoon canola oil 1/4 cup thinly sliced shallots 2 teaspoons red curry paste 1 1/2 teaspoons curry powder 1/2 teaspoon ground turmeric 1/2 teaspoon ground coriander 2 garlic cloves, minced 6 cups fat-free, less-sodium chicken broth 1 (13.5-ounce) can light coconut milk 2 1/2 cups shredded cooked chicken breast (about 1 pound) 1/2 cup chopped green onions 2 tablespoons sugar 2 tablespoons fish sauce 1/2 cup chopped fresh cilantro 4 small hot red chiles, seeded and chopped, or 1/4 teaspoon crushed red pepper 7 lime wedges