This is inspired from Jerry M. Woodall's experiment at Purdue University. The Purdue University team used an alloy of Aluminum and Gallium. The idea is that Gallium stops the Aluminum from forming an oxide layer. The oxide layer prevents the reaction of Aluminum with water to form Hydrogen.
The reaction is (3) H2O + (2) Al = (3) H2 + Al2O3
In the above experiment, liquid metal, which was bought on Ebay, is used as a source of Gallium. Liquid metal is an alloy of Gallium, Indium, and Tin and is non-toxic.