I posted the above before my trip a few months ago and am sorry that I did not print out the info from the TSA website.

I had a note on my dr's rx form that I needed to drink frequently because of a medical condition. I was carrying several pint bottles of water and making connecting flights. The first flight out the agent asked her supervisor who said the call was up to her. On the return flight the TSA agent was horrid and made us take apart our carry ons. We almost missed the flight.
My recommendation: Rx note fr4om physician plus copy of the TSA regulations.

I put the Bioteen mouthwash in several 3 oz small bottles(enough for 2 days just in case the checked luggage got lost or the flight was delayed) plus packed a big bottle in a zip lock in my checked luggsge. I had a hard time finding 3 oz bottles with screw on caps. If I had used the flip ups I would have put tape across the top of the cap.