Yes. We just recently changed to a sippy of water to take with her, since we have very dry heat and she was getting thirsty at night. Dd is 26 months. Ds was close to 3...he didn't take to the cup as well, also didn't have the Thirsties that dd seems to have ;-)
Sorry if I haven't gotten back with anyone via PM. Still learning the iPhone app and not very "techy".