Silicone Sealant - So this is important. It has to say silicone on it! I tried with different sealants and some worked... some really did not. The one in the picture below worked ok, but the best I tried was a "bathroom silicone sealant" which produced the final mould.Caulking gun - to get the silicone out.Hand soapA positive to make the mould out ofbowl or bucket that isn't used for food (because you're not going to want to eat of of it again!)