Emptying resivoir?

Question

We are removing the tile flooring in our kitchen and must move the fridge out of there. The problem is that we turned off the water line (we believe), and water is still coming out of the dispenser! We have left it in for fear that water will spill out if we remove the water line at the back. So question is A)Is the water going to spill out if we remove it? B)how do we drain the resevoir? (for future notice) C)how can we be certain that the water line we shut off in our basement is the correct line to the fridge?Joey V