What kind of cup did you use to introduce water?

I started offering water with her solids and C seems to like the idea of it, but not sure the best type of cup. I started with a sippy cup (nubby brand I think) which is ok but she has a hard time tipping it up enough. Then I gave er a small plastic regular cup and just held it for her, which she loves so much that she drinks too fast and chokes/ coughs and scares us both. I tried a straw once but she didn't get it on her first try. I hear sippy cups aren't good for oral development?

What did you do?

Oh and she takes bottles of bm occasionally but primarily gets it from the source, and is 7 months old.