Build a bucket - equip it and left click in water.
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If you go to building mode (E) then go to Delete mode (PC - Del key) (Mac Function + Delete keys) you can click on a building to delete it. If you then leave delete mode (escape key) you can reselect the building as if creating a new one and place it where you want. The building will be replaced without having to construct it from materials.
**Warning - This will screw up any scripts that use the building.
Sorry. Missed the "Library". (Users/YourUserName/Library/Application Support/unity.Denki.Autonauts)
The folder may be hidden by the system. Here is another way to get there...
In the OS X Finder click on "Go/Go To Folder..." in the menubar (Command Shift G shortcut)
Type in ~/Library (Tilda forward slash Library) - Then click the "Go" button.
From there Go to Application Support / unity.Denki.Autonauts