I use pigeon storage bottles, used to freeze them but took a long time steaming to get them back to liquid state for my daughter to drink, so she'll be crying for some time. ._.
Read Internet and started storing them at the back of the fridge where they will still be in liquid state and takes a shorter time to warm up. ^^
Probably just have to make sure the clean and sterilize all the baby stuff.
So far no problem with baby, she's 2 months.