Collect all of your supplies:
Take all of the labels and stuff off of your med. bottle
Warm up your hot glue gun and get your bottle top and rock ready
Now glue the rock to the top of the med. bottle cap and wait for it to dry.
Once it's dry put your key in the bottle, and screw on the lid
And then bury it in your yard. Try to make it AS NATURAL AS POSSIBLE so no one knows its there
You're done.....!!! Please like and comment...! Hopefully this helped you guys ;D