Don't use aquarium drops or anything un-natural, go with nature. Use an RV water carbon filter from wally world or the hardware store and add 1/4 tsp (1 gal h2o) to a whole tablespoon (5-10gal h20) of molasses. Let it set for 20 minutes and you are supposedly 100% chlorine and chloramine free. Heard this from Jeff Lowenfels, the dude that wrote the book "Teaming with Microbes". Google it if you like.
