Hi. You can express your breastmilk and keep it in refrigerator safely for 6 hrs. It could be fed using cup and spoon or directly by feeding cups. For expressing, you can express manually or using breastpump. You can refer to YouTube for proper technique. Ensure to completely empty out one breast before switching to other as your hindmilk (milk which comes at end) is rich in fats and is needed for satiety. Remember that exclusive breastfeeding till 6 months is best for your baby's physical and mental growth.