Coming from a WSM where I always kept the water pan at least 1/2 full, I'm wondering now how that translates to the SF. I'll admit that, for the most part, when I've done long cooks (port butts, briskets), I've used drip pans and have stayed with my habit of having some kind of liquid in them. But I've never thought to question if that is necessary. So, when y'all use drip pans, are they dry or wet?