I love drinking ice water, but I stopped after I found that even when using RO-filtered water in a separate ice cube tray, I was getting getting off tastes in the ice from something that was evidently living in the fridge/freezer.
I don't know if its spores or just odors or what, but I can't seem to get it out of the fridge; I'm pretty sure it's growing on or near the evaporator coils, in an area I can't access.