An adaptation of a couple of different reuses .Cannot begin to list how many people have shown pics/instructables on using bottle caps/lids as containers. Thank goodness it isn't copyrighted! My emphasis is on using in a Geocache.
Step 1: Tools/Materials
For instance, cutting bottle and pipe I used a pvc pipe cutter, you could also use hacksaw.
I prefer the larger bottles or soda bottles due to the actual top size.
Step 2: Another Set of Screen Shots (I Mean Picture, Oops) of the Tools/materials
Step 3: Prepping the Container
Step 4: Extra Layer, Use As Added Strengthening, or Length
Insert inside of bottle lid, determine length you need.
You can see the one camouflaged, I used a longer piece of pipe, and wrapped with camo tape and paint.
Step 5: Glue Pipe and Bottle Caps
Step 6: The Hardest Part, Prepping the Rock
Start to chisel until desired depth.
I saw this idea, larger scale, with like a 4" pvc threaded pipe with lid was mounted under a rock. This is scaled down. Hardest part is chiseling out the hole, unless you have something like a hammer drill.
BE SAFE, WEAR EYE PROTECTION.
I'm almost done, little deeper to chisel. Will use some kind of epoxy to hold container in hole.