Need advice

Hi ! I am a mom to a 3 month old baby boy. He has 1 kidney. He is exclusively breastfed and has a hard time taking a bottle which causes me to have a hard time leaving him. But aside from that I have my sisters wedding coming up and I am to scared to drink due to his solitary kidney. I’m thinking about introducing formula for occasions like this where I don’t want there to be any chance of me getting any alcohol through to him.

Any advice?