Breast fed baby won't take a bottle- advice?

So I have a 9 week old little boy who is exclusively breast fed. I have been trying to give him expressed milk in a bottle for a few weeks now but he will not take it. He either chews the teat or cries whilst the milk just pours into his mouth. This means that I can't really go anywhere without him, such as to get my hair done. I'm wondering if a anyone had any tips or advice for me? Thanks