Any liquids that are brought through security in a carry-on have to follow the TSA's 3-1-1 rule. However, sometimes those rules are murkier for items that are trickier to travel with—say, pies for Thanksgiving, or the pet hamster you're taking to your sick friend.
Get an answer on what you can bring, by going to Twitter and firing off a tweet to the TSA's @AskTSA account. This is staffed by employees with "diverse backgrounds in law enforcement, security operations, training, surface transportation, and customer service," and they respond to inquiries from 9 a.m. to 7 p.m. EST every single day.
AskTSA on their facebook page
Call AskTSA at 866-289-9673