Congratulations PinkAngel.
I think it depends on the baby how warm it needs to be, I have seen babies drink it straight from cold, but I think keeping it at room temperature is the likely to be the way that germs are most likely to breed. You are better to keep it cold and then warm it when required. If the place you are going to doesn't have any warming facilities, then your only option is to use your body temperature to warm it up. When mine were on bottles, they weren't new born, so were a bit more predicable in when you were likely to need the milk, so I used to stick it next to my body about half an hour before needed and it took the chill off it enough for them to be happy with it.