Rotisserie Chicken Tacos

Name: Rotisserie Chicken Tacos
Ingredients: 4 cups shredded rotisserie chicken; 1 teaspoon water; 1 teaspoon chili powder; 4 teaspoons lime juice, divided, plus lime wedges for serving; ½ teaspoon ground cumin, divided; ½ teaspoon ground pepper, divided; 1 ½ cups finely chopped cored plum tomatoes; ½ cup finely chopped white onion; 2 serrano peppers, stemmed, seeded and finely chopped; 2 tablespoons finely chopped fresh cilantro, plus more for garnish; ¼ teaspoon salt; 12 (6 inch) corn tortillas, warmed; 2 cups shredded fresh lettuce; ½ cup shredded pepper Jack cheese; Sour cream (optional)