Stacking water bottles.
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Previously:
https://www.homemadetools.net/forum/...536#post151349
https://www.homemadetools.net/forum/...229#post141842
https://www.homemadetools.net/forum/...721#post147971
https://www.homemadetools.net/forum/...348#post150603
https://www.homemadetools.net/forum/...257#post141964