1. If the water gets low, you probably will see a temp spike. If you have a plant water can with a long spout, it will work good to add some water. If not, use a gallon jug (milk carton for ex).
2. That is your choice. I don't even turn mine. Some turn it once, some turn and rotate, others use a 'half time' method - turn and rotate half way through, then again half way from that time to the end.
3. Again, I don't use a baste, but usually those that baste, do so when they turn.
4. Butts have a lot of forgiveness. Recommended internal temp is 190*, but you can go to 205 or so without much loss.
Bill