Hello. I'm wondering if there is any kind of food safe substance that could be added to a liquid that would actually cause it to glow without the aid of a blacklight. Googling seems to bring up every tom dick and harry who have tried tonic water and a blacklight, or someone who wants to jam a broken glowstick or highlighter in water, but that's not food safe. Any thoughts there? I guess what I'm looking for might be related to bioluminescent?