Now this is outside of the "rules" but I have never put my liquids in a zip lock bag and have never been questioned on domestic or international flights and we are talking a lot of flights and times through security.
Just to add there is not specifically mentioned in any regulations I have come across stating a TSA Precheck passenger must keep liquids in a ziplock bag (other than signage at one airport that I can't remember which is not a regulation but something a specific airport chooses to enforce, similar to San Jose having Clear get an earlier bypass lane and forcing TSA Precheck to stand in the regular line until a split after a "dog smelling check area").
As for the medical items only liquid form medical items need to be accounted for in a separate bag:
https://www.tsa.gov/travel/travel-tips/can-you-pack-your-meds-pill-case-and-more-questions-answered
Not trying to give you a hard time but just trying to pass along what I have learned from extensive travel and doing my best to research the limits of what the TSA has written regulations for (they don't exactly make it easy from what I have found hahah).
For full "clarity" (haha) including this:
https://www.tsa.gov/travel/special-procedures
Basically its stating you need to declare the medical needed items but this is specific to the liquids rule. Hence clear as mud as in the "suggested" area they specify gels but under the previous link I provided its liquids only. What makes it strange is while its considered the "liquid rule" when they refer to liquid form that is a subset of the liquid rule while gels and aerosol are also subsets of the liquid rule.