Expressing/bottle

[DannyWallace]

Hey, can anyone give me info (or a link to a website/book) about expressing/bottle feeding.

My little one is 6 weeks old and ebf. It's going well and I'm not planning on stopping. However I have a few friends who's babies will not take bottles, so we have decided to give DD a bottle once in a while (maybe once/twice per week) just to get her used to it. In a few weeks I might go out for a meal with friends so it would be handy that DH has something ready incase she needs it.
I expressed 30mls last night and my DH gave her that by bottle straight away and she took it well. No issues with BF after.

Approximately how much should I leave for her if I go out?
If I keep it in the fridge how do I get it back to the right temperate?

Is there an idiots guide to bottle feeding? As in, how to do it out and about (when taking milk out with us) and things like that.

Like I said, we're in no hurry as this is just getting us ready for the future.
Thank you

Rough rule for a BF baby is an oz per hour you're gone.

Storage rule for expressed BM is 6/6/6. Breast milk is good for 6 hours at room temperature, 6 days in the fridge (well on the shelf not the door), and 6 months in the freezer. If you need to feed expressed BM out and about keep it in the fridge until you have to leave, and if you're going to be out more than a few hours before feeding keep it in a coolbag/with a cool pack. Warm it to blood heat in hot water before feeding (unless you have one of those weirdo extremely chill babies who doesn't care).

@SoHotADragonRetired thank you so much!!