My gf has yeast infection but I want to give her oral sex. What should I do?

Ok so I have a gf who has yeast infection. A couple days ago we planned a day to spend together at her house and every time we spend time together alone we always end up having sex. We planned on spending the day together wednesday so I have a few days to plan on some safety precautions. We have sex and I want to eat her out but she has the yeast infection in her vagina. I heard that if you give a girl oral sex that afterwards you could wash the areas of your mouth very thoroughly with vinegar or other water solutions. Is that true? I need as much advice as possible before wednesday on what I can do and don't give answers saying don't have sex because when we get around each other it's inevitable lol so please tell me what you can. Thanks