For non-sponge bath washing I have a 5 gallon bucket with rain water (some times spring water from the crawlspace) filtered through a beach towel.
I stir in about a cap of bleach and that lasts me about a week and a half for quick hand
and or face washing, as well as washing dishes.
Water is pulled from the "clean" white bucket and allowed to fall into the orange slop bucket while I wash.
That way the bleach water stays cleaner longer.