kew, I second what others have said: you need to develop some confidence about breastfeeding before and when the baby arrives, and you and your DH could really benefit from speaking to someone who knows about it. Is there a local BF group you could attend to get some experience? Or could you find a local BF counsellor? Or is there a midwife BF specialist at your local maternity unit?
I'm afraid it the first port of call when the 'baby is crying and won't feed' is formula without trying some other things first, then BF is likely to stop fairly soon afterwards because BF relies on demand to keep the flow up.
for example, it is really common to imagine that a baby is 'crying and not feeding' in the first 2-5 days after birth. But what happens is (typically) like this: baby often has a first suckle straight after birth. Then anytime from a few hours up to two days or so, baby will start to suck like mad, crying frequently in between to suck again. Sometimes this need to suck (crying) happens every hour for up to 24-48 hours. It can be exhausting! But this is necessary - because the baby is sucking to drain the breast and draining the breast is what makes more milk.
Sure, a bottle of Hipp formula or whatever in this period will make a baby full and quiet. And keep DHs from feeling anxious! But what happens in this kind of situation is then not enough milk is made to provide a full tummy, so when baby goes back to the breast, the crying and very frequent feeding starts again. Mum can't see any milk coming out and assumes 'she has none'. More formula is given; even less breastmilk is produced... And so on, until BF stops altogether.
So having a bottle of formula on standby, while it seems like a good idea, can often mean the end of BF completely. not always but in order to get a good BMilk supply, it is important for you and your supporters to understand how breastfeeding works: the more your baby sucks, the more milk you will produce. Just because you can't see it going in, doesn't mean it isn't. Experienced midwives and BF counsellors will be able to tell if your baby is getting milk from the wet nappies, colour of baby's poo and general wellbeing.
If the baby doesn't feed for some reason, there are other things you can do: express some milk and feed from a cup or syringe; hand express to try and get your milk flowing. You can get instant help from a breastfeeding helpline for much of the day and evening. You can change the position of the baby's mouth to get a better latch and thus get more milk out. You can try taking your top of and undressing the baby and snuggling up to let them latch in their own time and 'naturally' or take a bath with them. You can let them suck more and as long as they want to...
The plan to have formula is the very very last one I would choose if I wanted to BF, knowing what I know now...
As a very last resort, it you do feel you need to give it, there are 24 hour supermarkets you can send someone to...?