Once you have the pie pan mixture poured into a vase all you need is alka seltzer. We use the generic brand from Dollar Tree, and it works great! Break 1-2 tablets into pieces, drop it in, and marvel at the beautiful bubbling lamp. Add more for more bubbles or to get the bubbling going again once it dissipates - See more at: http://www.growingajeweledrose.com/2013/09/glowing-oil-water-experiment.html#sthash.ty1MIYTo.dpuf