The health inspectorís here!
Solution: Aqua-Mobil-Deluxe(only € 71,40 incl. VAT  for 3 days)

which will meet all your health and safety requirements .
Tested and recommended by surveillance and veterinary officials.
Fresh water supply under pressure from the mains supply without using excess power. A volume of roughly 20 Litres of hot and cold water available with excellent thermal isolation. This compact and mobile water station inc. used water tank meets the EU health and safety requirements.