At the food expo, I saw some interesting black water.
blk water claims that blk. water contains both fulvic and humic acid (found in soil, sediment and aquatic environments). But neither fulvic acid or humic acid are required in humans. The addition of these two acids to water in no way enhances the nutritional benefits of water.
Anyway, I tried it and it tastes the same as water but psycologically it feels weird drinking black water because it looks dirty.