"Very fun for a party! I used Knox® Gelatin and a bit of blue JELL-O® because I wanted the 'water' to appear very clear. But blue or green JELL-O® would work just as well. Note that the amount of Knox® or JELL-O® will relate to the size of the fish bowl you use. My 'fish bowl' is a square flower vase that holds 8 cups of water. Follow the directions on the box."