Just a note about putting anything other than water in a water pik....The instructions that came with mine explicitly say that you shouldn't ever put anything but water in it. I'm not altogether sure that doing so wouldn't invalidate the warranty.
I buy Cacique bras. They're really the only brand that fits me (and isn't wildly expensive) because I need a large cup size, but my band size is only a 36 or 38. it's not easy to find that combination. I wait for sales - buy two get two free is pretty common - and stock up.