As much as I hate to say it, Walmart sells it. The brand is Sea Mist or something like that. Also, as for ingredients, as stated before, surfactants are bad but if it has a chleating agent, that is ok. Chleating (sp) agents are simply there to maintain the bond or "mix" of water and ammonia so they don't seperate. If there aren't any ingredients on the bottle, shake it good. If you get foam, it's no good but a few air bubbles that burst immediately are ok. After all, if you shake a bottle of water, you will get some bubbles just like when you pour water in your tank.