Hi, I've decided to set up a darkroom, however, the only options with regard to space is the bathroom (which is very new and I'm renting) which I'm hesitant to use in case the chemicals stain anything, and a small shed out the back. So unfortuantely it's looking like I need to lightproof the shed and use that. So....is it possible to use a space that doesn't have running water? There's also no fan. Can it be done?