Getting 6 mo old to take the bottle

well city get my baby girl to take a bottle. tried 2 day with the medela bottles n she was furious did not want to take she will play with the bottle but did not want anything 2 do with it. she did take it for s while when she we 6 weeks old because thought I was goin back 2 work but we decided not to so I stopped giving her the bottle. I will be a bridesmaid in October n i need to get her take the bottle at least for that day..she will be 10 months by then idk if i shud jus get her take the bittle or sippy cup. any suggestion I would appreciate ladies.