I feel like such an idiot for not realizing RO water had to have something added to it. As of this post, I've had 6 more dead. It's horrible.
I went to Petco this morning, really my only option, but they didn't have any Kent's (actually the guy told me in his 6 years of working there, he'd never heard of it.) I bought some NovAqua Plus Water Conditioner, which seemed to be the closest thing available. I'm grasping at straws, I know.
One question - am I going to also have to add some kind of pH buffer too? Would it be easier for me to go back to tap water and just try to deal with the nitrates? I love my shrimp and actually enjoy them more than my fish. I'd hate to have to give up keeping them.