Just keep offering. At 7 months, it's all you can do. Have you tried just plain water?
We also use the Tilty Cup and it made a huge difference at 8 months of him using it more and liking it. They don't have to tip their heads back, much easier to drink from.
I just put it on her tray when she's done eating her solids. At first, I would put it up to her lips & show her how to use it. We only do water in it though I did diluted juice once. It's just for practice right now.
Re: Sippy Cups: Any tricks?
Just keep offering. At 7 months, it's all you can do. Have you tried just plain water?
We also use the Tilty Cup and it made a huge difference at 8 months of him using it more and liking it. They don't have to tip their heads back, much easier to drink from.