We just flew in October ~ for liquid meds, there isn't a size limit, but it needs to be in it's original container.
As for pills & vitamins.......I have a weekly pill holder, and I filled it for the 1st week, then have one of the multiple pill containers that screw together, and put my meds seperatly in each one...also vitamins seperately. I did not carry any original medicine container with me. I did have copies of each med, with my name & such from the pharmacy "just in case", but never had to show it.
When in doubt, go to the TSA website, it has everything.
Our airport isn't that far away, and we hadn't flown in several years, so we just went over one day (during the week, when it's less crowded) and walked up to the area, and got a extra TSA person and she was very happy to answer all of our questions on all subjects.