I just bought a house and in one of the closets I found a plastic bucket full of water and several batteries soaking in it. No idea why anyone would do that. The water is discolored, and I have cats, so I am afraid one of them might try to drink it. I want to get rid of it to be safe, but I am hesitant to pour it down the drain or into my yard because I suspect this would be toxic. Is my fear unfounded? What is the best way to dispose of this?