Questions about formula

I was finally taken seriously by a GP (🥳) who diagnosed our little girl with non IgE cow's milk allergy with a possibility of lactose intolerance on top of it. It seems that we'll be prescribed nutramigen for her but I've seen a lot of posts saying babies refuse the formula because it doesn't taste nice. My baby is ebf and I've cut dairy out of my diet but because of the potential lactose intolerance, her GP wants me to cut out one feed a day and give specialist formula to lessen the load on her gut of having to deal with the lactose in my breastmilk. Our baby started refusing bottles when she was around 3 months old (she's now 7 months) and we haven't been able to get her to latch onto one since. She'll either not even open her mouth or use it as a teether and just chew on it. I'll have to get her used to bottles again for when she starts nursery in a couple of months, but that's a whole different post. I'm just concerned that if she does latch onto a bottle again but it tastes horrible, that it will seal the deal and she'll never latch. I've seen other people recommend pepti 1 instead. Is that interchangeable with nutramigen or is that for something else? I'd be happy to buy it without a prescription since we won't be using much at all but just not sure what the difference is. Also is pepti 2 just their version of follow on milk?