Try Dr.Brown's bottle. We tried lots of different techniques, what finally worked with our son is, starting bottle first thing in the morning when he's just woken up from sleep.
As he's hungry and thirsty he took in an ounce and then wouldn't take anything at all and went back to sleep in an hr or so, when he woke up again we gave him the bottle, he just drank an ounce in 1/2 sleep and refused again and played and slept.
The third time he woke up, we still gave him the bottle, and this time he took 3 oz straight.
From the afternoon i breastfed him, as he started missing that.
We did this for a couple of days and he picked it up and was fine alternating between bottle and breast.
At times he'd refuse, but later got used to it full swing.
Hope this helps!!
And finally, be patient and relaxed. Babies can sense that. I know its easy to say, but it is really hard to do as its not really easy.