You will need:
Bottle with cork charms
mine are from Oriental Trading Company ($6.50 for 6)
Sheet moss or ground cover
(I found some ground cover at an apartment complex and took a bunch)
Different sizes of sand, pebbles, and rocks.
I used tiny polished or river washed stones.
(all found in the road or yard)
You'll also want some tweezers that can
fit down into the bottle.