You could try looking at a gardening/pool care store.
I drank hydrochloric acid and isopropyl alcohol less than two weeks ago. This combined was 1/3rd of a plastic water bottle, green with an oily smell. The hydrochloric acid came from a plastic container that said, "Fatal if swallowed", so I filled 1/3rd of a water bottle of it, but only drunk half, and immediately threw the rest in the toilet. It was a very exhilarating experience and I was not afraid. The last thing I remember feeling was, "I'm going to go see Heaven". I fell into unconsciousness for twenty hours and slept through most of the next few days.
At a glance, it would have looked like food poisoning. I don't know how I survived. It was a miracle. Even today I still felt a little bit of the acid.