1) transport using cooler bag pack with lots of ice gel pack, pack newspaper in between space to keep it cold for a longer time. frozen milk shld be able to stay good for at least one hour. good for travelling from east to west of singapore.
2) how old is yr baby?
3) to prevent wastage, you can try to warm up just enough for baby, and top up when needed. rightfully, warm milk must be finish asap, not to store more than 1 hour. there are articles claim it can be put back to fridge and use later, but really not advisable for young baby , afraid they might be prone to bacteria