I am EBF my 13wo and up until about 8w he was happily taking the odd bottle of EBM from a dr browns bottle. On NYE he had jabs and as we were going out for dinner and I'd be having a couple of wines I took a bottle and he just kept chewing on it and spitting it out. I ended up having to breastfeed and put it down to him feeling off because of the jabs. However, I've not been able to get him to take a bottle since. I went to the theatre last week as I was gifted the tickets. All week I was worrying about this but the day before I got him to drink a bit of EBM from a mam bottle. However I was gone for 7 hours and he refused a feed all that time! 
My older son happily mix fed (he was FF and BF) so I'm at a bit of a loss here.
Does anyone have any advice for me? Shall I try a different bottle, different teat? Has anyone else been through this. Aside from the fact i would like the odd couple of hours out or be able to take an early night while dad does a feed - I only really wanted to BF for 6 months and at this rate I can't see that happening.