I did the water first because I didn't want to waste the milk and it's messier to clean up than water! :wink:
Actually, with the sippy cup, I started without the no-spill thingie in so she could get the idea that something good comes out of it. Then once I noticed she tried sucking, I put it in (that's before I switched to the Nuby, which you can just sort of chew to get the liquid out).
Also, everytime I was drinking water from a proper cup, I'd offer her some too (now THAT got messy!)