You are allowed to carry them on in the Kippie baggie. The TSA is not in the business of being the revenue police. If airlines want to charge $5-7 a pop for a small airline bottle of booze, they can expect some small scale smuggling. I've seen people ask for just a cup of ice, and the FA just smiles and lets them have it, so it seems to be "don't ask, don't tell" as far as regulations about drinking booze you bought onboard yourself. But the polite thing is to not become visibly intoxicated and not let the FA notice anything that might force her to feel obligated to take action.