Girls, hello everyone, we have lactose intolerance, although the pedia…

Girls, hello everyone, we have lactose intolerance, although the pediatrician started arguing with me when I said that it's possible we have lactose intolerance and asked for tests, he refused, went privately to a gastroenterologist and she confirmed it. Now we ordered drops on Kaspi, as we don't have them in our city and they told us to start feeding with formula and if the drops don't work, then milk. Tell me please, who has encountered this, what is the best formula? My son doesn't accept either nipples or bottles, maybe there are some good bottles you can recommend, please tell me about the introduction of food, and what you were introducing, thanks in advance ?