In the past few years, we have covered a whole host of hidden camera you can put anywhere in your home or office to record video. This 4K Hidden Spy Camera Water Bottle is also worth a look. It records 4K UHD video and has motion detection. You can put real water in the bottle without damaging the electronics.
This spy camera water bottle has night vision range of 8 meters. It can record video to 128GB and has a viewing angle of 90 degrees.
[where to get it]