Best hose to carry for general purpose & flushing tanks

Two hoses. A gray one for flushing the tank and a white one for potable water. Reduces chances of contamination. If not using a pressure regulator or use one at the city water inlet or inside, use a high pressure rated hose (like a Valterra, eg.). We have a "no-kink" white hose that has a big ol' kink in it that won't go away, pffft...