The important instruction is that the item must be completely frozen. Usually take a 16oz/500ml bottle containing frozen water. Open it and suck out any liquid water just before you get in the security line. Place it separately in a bin, since it would otherwise require further screening (due to its shape and density. If you encountered questioning politely ask if he/she would speak to another agent, usually they will agree.
Carry Frozen Items on a Plane?
