Filming next scene

Now we continued on to the next scene. For scene 2 I was the only one on camera. As per the script, I was to walk down the stairs towards the kitchen to grab snacks for the others upstairs. To make it realistic like a real sleepover, while I was walking down the stairs I had Addyson and Haley in the room talking loudly enough to hear on the camera like they were still having fun and having a conversation. And the cup had no water when I turned around. This scene required a little more work. To make the glass not have any water or ice quickly, we had Robin behind the counter with an identical glass to the one I had, so when I turned around she would switch them out quickly and silently. I then had the camera pan and follow me as I looked around acting confused.