My son just turned one last month, and has not had any formula. What we did to get him used to milk, was to have him try a sip or two a day, and then give him water. At first, he would look at me like I was trying to poison him! He did get used to the taste though, and it helped to let the milk sit out for 15 minutes or so, because he was used to warm milk from the tap, not cold milk from the fridge. He loves water to drink, and he always has a sippy full of water available for him to drink throughout the day. We also started having it as an option during meals. It took about a month, but now he will drink about 4-5 ounces of whole milk in a day.. sometimes more.
I checked with my pediatrician at his one year checkup, and she said that babies his age should have 3-4 servings of dairy a day. So, nursing fills two of those servings for us (we're down to an AM and PM nursing session!), and he eats plenty of cheese and a serving of yogurt every day. So, any milk that he drinks at this point is extra. Once we are done breastfeeding, I think that he will have enough dairy in his diet between milk, cheese, and yogurt to be fine.
So, just keep offering, and I wouldn't push it, unless you are wanting to be finished nursing soon. I'm gradually weaning my son, and it has gone well so far.
Hope this helps!