Hi, I'm trading with someone in MT (34-45'F as high, 16-25'F as low) from Denver (today 46'F/21'F, tomorrow 28'F/9'F) and it has me nervous that the bottles will freeze and burst if I ship FedEx or UPS Ground. Does anyone have experience with this? Is it safe? Should I wait? Just have the boxes held at FedEx locations until we can pick them up?