drop a cunk of lithium in water stick a nail in it so it sinks that will get you hydrogen ina hurry and wont ignite like potassium or sodium unless you use very thin pieces. i get all my lithium froma abttery store... just ask the guys for dead lithium batteries( camera kind not those lil disks) cut them open ans pull out the strips. use mineral spirits or a very light oil cuz lithium is an alkali metal and will oxidize very quickly. a little oxygen and water absorber found in some food packs is really helpfull too