E.B.
My nephew just turned one on Nov 12th and has the same issue. He loves his bottle. He sometimes likes Munckin sippy cups (like the Dora/Diego ones- they have a very wide piece to drink from) and Avent sippy cups (the ones that you just change the nipple to a soft sippy cup type top- if that makes sense). The Avent ones are very similar to a bottle. Sometimes it just finding the one that they like, unfortunately no one wants to spend $ on something they will not use.