My 3week old will only feed from one breast so I have to express and use formula to top up using bottles. This means I have to take bottles out with me. I've been putting the bottles in my change bag as it's quite cool outside but in further reading I'm worried about hygiene etc. How do you take milk (about 60ml portions) out for a day? Do you just use a small cool bag and ask cafes etc. For warm water to heat? Thanks.