Heavy-duty Hummingbird Reservoirs" using some PVC pipe ends and some hardware. But now it's January, and while there may be a few hummers at your feeders, you might have a few of these reservoirs sitting around now without a purpose.
Check this out! Clean out the water, and chain them together for a wild bird feeder in the winter! Fill the cups with your favorite seed or dried worms...use a variety to attract different species.
Be sure to use a squirrel baffle or something similar to shield the cups from rain. Don't have a baffle? Try drilling a hole through an old Tupperware lid (or bottom turned upside-down) or simply hang the cups under an overhang, such as on a patio.