I ordered the hydrogen peroxide (it is conveniently available in 35% strength as a nutritional supplement) and picked up some sulfuric acid from the auto parts store (battery acid). Regular battery acid will not work, you need concentrated stuff. You can concentrate sulphuric acid by boiling it in a glass beaker, but you must be VERY careful and do that outdoors or under the fume hood. Concentrated sulphuric acid is very nasty stuff, be extremely careful handling it. Also remember to NEVER add water (or hydrogen peroxide) to the acid, always (slowly) add acid to the water. Otherwise you risk thermal explosion because reaction is exothermic.