The material below is Open Game Content from a 3PP Source
Bottle of Messages
Aura faint illusion; CL 3rd
Slot none; Price 300 gp; Weight 1 lb.
This green glass bottle has a tiny winding key on its elongated stem that, if turned, causes a shadowy cork to slowly become substantial over a 1-round period. Anything the owner of the bottle speaks into the bottle during this time (up to 25 words) gets trapped inside it once the cork fully manifests. As soon as the cork is removed or the bottle is smashed, this message is released exactly as if the owner had spoken the words at that moment. Once the bottle releases its message, it shatters.
Requirements Craft Wondrous Item, magic mouth; Cost 150 gp