3D Fuel is an American and European manufacturer of 3D printing supplies. "After conducting a survey with its user base," 3D Printing Media Network writes, "3D Fuel found that the most desired material to add to its offer was: Water soluble support filament." Thus they've come up with HydroSupport, a PLA-like filament that breaks down in water and is eco-friendly:
HydroSupport comes in both 1.75mm and 2.85mm diameters, with lasers used to ensure consistent diameter during the manufacturing process.
One warning is that since it's water-soluble, if you live in a humid area, you'll have to store the stuff in a sealed container filled with desiccant.
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You can learn more here.