You are not going to get crispy skin at 225 or 250 no matter what. Water pan, or no water pan. So...if you want to use a water pan...I see no problem with that. If you want to try and crisp the skin "post-smoke" using one of the numerous methods on this forum, whether you use a water pan or not during the smoke process probably has little consequence. I love crispy skin, and I get my fill from other cooking processes, but with smoking, I feed the skin to my dog, because the meat is so succulent from smoking on the SI, I DO NOT miss the skin, and the dog is very happy. Win win.