What I done is, expressed an hour before my LO feed. I use a wearable pump, I pumped and poured it in the bottle for the LOs feed. Found that more helpful
I exclusively pump and if I’m going out for the day, I will put bottles of milk in a cool bag with ice packs, then I will warm the bottle in a jug of boiling water to take the chill off before feeding my daughter x
I carry it in a cooler with ice packs. I have a portable warmer so I can warm the milk when she's ready to eat.