Supplementing

So I plan to exclusively pump but with our wedding anniversary and Valentine’s Day not too long after I have her I really want to be able to have a few drinks once in awhile. Anyone else give a formula bottle occasionally if you just had a glass of wine or a beer and haven’t had any issues with baby? I’ve even heard of giving a formula bottle before bed cuz it holds them over longer but I just don’t know if it will cause any stomach upset or anything having formula only occasionally.