next month we are driving 6 hours to stay w/family for a wedding. driving up wednesday night, wedding is saturday afternoon. we are leaving the baby w/a sitter for the wedding so i need to have enough milk to leave w/her- i figure 16-20 oz to be safe. is there any way i can bring up some frozen BM from my stash and have it stay safe in the car for 6 hours? i would expect it to thaw at least a little. or should i just pray i can pump enough extra the two days before the wedding?? eek!