12 litres of water ,wouldnt bother wasting my time,you would always be filling it up.Time = money lost,now a trolley system 45 litres now thats a diff story,three houses min then fill it up
you could do 6/7 houses if your only doing the tops,easier on the back as well,
if you pm me i will give you the details Ive stored for making a trolley system,suppliers lists for diy,Ive worked it out build one for under 250 squid,but you would have to allready have to have your own d/i or r/o systems in place.
gaza