Breastfeeding in public

So I'm breastfeeding with a couple formula bottles here and there. I've only wanted to breastfeed because of the benifits it gives him so I have cut down a lot on his formula and only breastfeeding (because I'm at home all the time with him.) I wanna cut out formula completely but I'm nurvous to breastfeed in public. How do you other breastfeeding moms breastfeed when your out and about?  Also what helps boost your milk supply?