Polyethylene glycol (PEG) is a potential water-soluble support mechanism.
PEG is a flexible, non-toxic water-soluble wax-like polymer used in cosmetics, medicine, and many other products.
Jesse Brennan pointed out that Lee Valley sells PEG 1000 and PEG 1450 for CAD$6/lb (USD$11.25/kg). PEG 1000 melts at 37C, PEG 1450 melts at 43C. (PEG x means PEG with a molecular weight of x). Lee Valley is an expensive but high-quality Canadian woodworking tool store. They sell the PEG as a "green wood stabilizer".
via a random MSDS, http://www.jtbaker.com/msds/englishhtml/p5029.htm "Melting Point: Melting point increases as molecular weight increases: PEG 400 = 4-8C (39-46F) PEG 600 = 20-25C (68-77F) PEG1500 = 44-48C (111-118F) PEG 4000 = 54-58C (129-136F) PEG 6000 = 56-63C (133-145F)" -- Main.SebastienBailard - 22 Oct 2006