Difficult one....
Your milk doesn't 'come in' properly til day 4/5 but you can give them the boob for colustrum pretty much as soon as they're born.
Invest in nipple cream - lansinoh is expensive but excellent. I'd prioritise that before bottles etc
I don't give a stuff what people say about it not hurting if the latch is right...
I breastfed DD1 til she was two and am still feeding DD2 (now a year old) and the first week can hurt like hell until your nipples have 'toughened up'/desensitised. Get the cream as a priority so you don't get chapped.
Make sure you have a comfy pillow/magazines/FLUIDS on tap/any breastfeeding tea containing fenugreek (tastes yuk but helps with flow).
I was in tears with DD2 Day 5 - thought milk was drying up. I was utterly disconsolate because I had no access to milk/bottles (live away so no 24 hr shops). I would have given a 'one-off' bottle at that point as I was panicking despite having been through it all before.
But I had no choice and with a cup of tea/shouldersbackandbreathe we were okay. Quite possibly a one-off bottle would have affected milk flow (you just need to keep putting baby to the breast essentially so if you miss a feed early on that could exacerbate the situation).
Nipple shields similar issue - I had some sent over out of panic but was okay by the time they arrived. Early on they can cause nipple confusion apparently.
Getting the equipment in NOW depends on whether you are planning to express/mixed feed/get mum MIL DH etc to give a bottle/returning to work early
If that is the case you need the equipment anyway. (neither of mine would take a bottle as i hadn't introduced one by seven weeks).
Breast pumping - even regularly - in the first couple of weeks can also end up causing flow problems for some.
Best idea - as long as you've got 'babymoon' i.e. in bed with baby letting him/her latch on as/when while family feed you and keep your fluids up.
Lashings of nipple cream and lots of skin-on-skin contact.
Short answer
- Get the equipment if you are planning to use it/express after a few weeks anyway
- Use the one freebie bottle/have one carton if you are going to freak out at not having a back-up (but be aware it is a catch-22)
- Know at worst case you have access to supermarket presumably and/or DH could take baby for a car-ride at 2am? which might mean the formula ends up not being needed anyway as movement rocks baby to sleep
- Prioritise your nipple cream/bed environment/babymoon (hate that word)
Oh, and don't give yourself a harder time if the birth/feeding etc doesn't go to plan or meet expectations (lower them now!!) The first few weeks are tough on everybody whether it looks like it or not.