Hi K.-
Here are a couple links to answer at least some of your questions.
http://www.medela.com/NEWFILES/faq/coll_store.html
*check out last sentence in the Tips for feeding Breastmilk in the bottle section*
http://parenting.ivillage.com/newborn/nbreastfeed/0,,484b...
Also, found this on the BabyCenter website-written by another mother:
"Re-refrigerating or freezing - no. Breastmilk is, however, good 6-8 hours at room temperature. It should not be reheated once it is heated as you breakdown the nutrients."
Hope this helps. You could do a bit of research on it online and see what you come up with. Good luck!