Hi Twinkle,
Re EBM and formula, I asked my PD before leh...he advised once the EBM is warmed up or formula is mixed, after 1 hour should throw away coz in our climate alot of bacteria grows in the milk...no good for bb's tummy.
So he advised when we go out, should bring cold EBM in a cooler bag with ice pack, then when its time to feed use hot water to warm the bottle of milk up. Or if using formula, pour warm water into the milk bottle first and keep it in the thermal bag to keep it warm, then when its time to feed mix the powder in and then feed. Alternatively can use those thermal hot water flask to keep the water warm, then when its time to feed pour the warm water into the bottle and mix the powder.