Breastfeeding vs Formula, can you do both?

Janay
So I was breastfeeding for the first two weeks of my daughter being born but then I started using formula since we have two other children and it can be a bit much. I still have milk, I feel bad for not breastfeeding because I really wanted to and I know it's better. What can I do? And it's been very beneficial for dropping weight even though I'm not doing it as much. 😏
Also when breastfeeding mothers drink liquor what do you do to get it out of your system?