This geocache has a legitimate Teamwork Required attribute, so although it could be possible to do this as an individual, team up with someone else, even a muggle, and do it as it is intended to be done. DO NOT USE WATER. It won't work and it won't drain.
This geocache was inspired by a Michigan geocache, "Are Yew a Blow Hard?" by RDC4106. I especially appreciate Badfeet's help in constructing it and getting it painted.