"It's the same as breastmilk". If they still hadn't decided what to do and were running through why they thought formula might be ok, I would (gently) point out that it isn't the same, it's just adequate food.
"I was formula fed and I'm fine". There's not a lot you can say to that without being really insulting...
"The midwife said to have bottles and formula just in case." I had these in reserve too and breastfed for 7 months. Having these things at home helped as I found if I got stressed, my milk didn't flow. Having a back up helped me relax and thus helped me to breastfeed, so IMO this can be a good thing when it is a back up.