Smoky: "Bottle suckers?" I love it. Anyway, I'm glad you have stated my situation well.
I heard from The Water Store today. He said what he put together for Bernie wouldn't work in AZ. I'd prefer to do the two filters, but I'll probably end up with one of those large softener containers. I don't care if the AZ water is palatable, since I don't drink it. I'll leave the equipment in AZ when I summer up here where the water's quite clean. I'm delighted to have confirmed that sediment doesn't stick to the plastic plumbing. I think a lot of it accumulted in my holding tanks, though. I need to learn how to remove and clean the traps, I guess. There is some hard water sediment in the kitchen sink. Short of manually drying it thoroughly after every single use, that can't be avoided.
Assuming it takes out the salty softener taste, maybe I'll get one of those Britta pitchers to filter water for the cat, so I don't have to buy many bottles all the time. Her dish is one of those large covered travel dishes. She puts her front paws on the donut shaped cover to drink, even though she's no longer a small kitten and doesn't need to. She's so used to it, I hate to change it to something smaller when we're docked someplace.
--pat