I came across this article that seem really whimsical and silly, but it appears to be a legitimate way to general low amounts of energy that "converts evaporation energy into kinetic motion" as the scientific article states.
Here's the link to the published article:
Drinking-bird-enabled triboelectric hydrovoltaic generator
While you won't be powering your house from this or similar devices, I could see something derived from it powering sensors in the field, especially if the energy is stored in a capacitor for later use.
Here's an article at "New Atlas" that summarizes the above link and gives a less-technical description:
High-level description of the drinking-bird-enabled triboelectric hydrovoltaic generator
If any of you have a drinking bird toy, you could try creating your own generator that only uses water as the consumable fuel!
