Other owners have found that a spray bottle filled with water works, but that can work against the owner if it is water dog as they will think you are playing a game. (puppys-place.com)
Cover the eggplant cubes with an upside down plate and place a second bowl filled with water on top of the plate. (fontanaforniusa.com)
But there are solutions that hold far less energy, like cutting the bottom off a water bottle and sticking it in the soil, then filling it with water for sustained irrigation. (treehugger.com)