J.C.
I have been there! My son took forever to learn to drink from a sippy cup! The best advice I can offer is, be patient and keep trying but don't push! I kept buying different sippy cups until I found one that my son liked. It turned out to be this random one I got at Costco of all places, but I had a dozen other suggestions from people that worked for their kids. My son really didn't start until about 13 months, but it did eventually happen!!!
GOOD LUCK!