Woo hoo on 6 months hun. That is such fantastic news. I know there were times you didn't think you'd make it - that's a true success story. Would you consider posting in the success stories thread here - https://www.bellybelly.com.au/forums...tories-65375/? It is a great way to inspire others who are having a hard time.
I think any sort of sippy cup will do. With DS1 I did lots of research and spent a fortune on the most recommended sippy cups to try. He ended up drinking from any cup he was offered. Then DS2 started on the cheap disposable supermarket ones as that was what was there when he was thirsty one day. Lesson learnt on buying the expensive cups!
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