I know this is late, but I never use a water pan with skin-on poultry. First, I fill the cavity with mire poix (equal parts chopped onion, celery and carrots), so the moisture comes from the veggies, internally. Secondly, the skin is a natural moisture barrier. External moisture is not going to penetrate the skin, so why bother? Skinless? Yes, a water pan is useful. Skin-on? ...Not so much.