Making glow water is so easy! As far as supplies, all you need are UV reactive highlighters or markers and water. You can find 2-packs of jumbo highlighters at Target for under a dollar. Pop the back off of the marker, and pull out the ink soaked felt that is inside. Then soak the felt in a small quantity of water. I used two cups of water per highlighter, and ended up with insanely bright glow water. It could definitely be diluted further, but I wanted it to GLOW!