Who says it has to be a cup. You can try a straw, spoon, medicine dropper ect. It really doesn't matter how the liquids get into the child. Maybe try a cup w/out a cover, more messy but worth the work(then you don't have to wean off sippy cups).
Or just keep offering it and he will get the nack of it, even give the baby an empty cup to play with. The learning process says put EVERYTHING in your mouth. Do not panic!!!!! This is only 1 milestone. If you start panicking now, your going to have an ulcer by the time your child is two!!!!!
Your child will naturally give up the bottle if you continue breastfeeding :) Your giving your baby the best start. I love the fact that you are still Bf. Send me a message if you have any questions about BF. I'm a certified lactation consultant.
Good Luck! If your child can learn to breastfeed, he will eventually learn how to use a cup. Bf is alot harder to learn. The best time to wean from the bottle is between 9 months old to 15 months. So, you still have alot of time to worry about weaning from the bottle. It's best at 1 year old, but most can be weaned from the bottle by 15 months.
My child was more than happy to wean from the bottle. She just substituted me.
Just write back if you want to talk.
H. B.