White hose are potable water safe, while your garden hose is not.
We also use bottled water simply because of preference, taste and safety reasons...
But... we also continue to use the white hose for our water supply.
Think of how many times you reach for the faucet for cooking purposes, brushing your teeth, washing your face etc.
Much safer if you use the right equipment for the right job... certainly not worth the few pennies/dollars you may save on a garden hose. Not to mention contaminating your fresh water holding tank.
Put another way...
Would you use low grade gasoline if your tow vehicle called for premium high test, or low grade engine oil, or cheap tires to save money?