+1 on the $9 RR Plissoft. I also have a White Knight that I affectionately call the Boss, but the Plissoft is just as good at 1/4 the price... We have very hard water and I found that using hot water from a Sparklets dispenser or using reverse osmosis filtered water made more of a difference than brushes......Nothing beats a $9 RR Plissoft.
Not very much water is required. A typical 16.9 ounce bottle would probably last for a couple weeks worth of lather. You can used your tap water for all other aspects of your shave, just use the bottled water for your lathering.
Nothing beats a $9 RR Plissoft.