My cat loves the Petmate Fresh Flow and at $32.99 from Purfect Cat Supply you can't beat the price. They say it helps your cats health by filtering the water and oxygenating it.
Try giving your cats a bath in Dawn soap. It dries their skin a little but kills fleas instantly. As far as for your home I have used, Natural Flea and Tick Spray. It is natural and safe to use if you have previously treated with Frontline. Can spray on your furniture and their bedding.