Garden Hose (Mount Florida G42)

I bought Power Washer unit from charity shop to clean away the gunge-moss stuff outside our closes which is causing elderly neighbours to slip & fall, most dread leaving their house. It doesn't get removed due to landlords palming it off as one another's responsibility. I didn't realise until I got it home that the 'power washer' doesn't have a water tank and needs a Garden Hose attached to it for it to work.