can i use the tommee tippee exspress and go bags in the normal tommee tippee bottles or can i use the bags and just empty the brestmilk from the express and go bags and just poor it in the bottles wen needed sorry 1st time i would be useing my breastmilk befor eany advise would be grate please and wens the best time to start exspressing breastmilk befor babies due date xxx