WaterCarrier

A device with handles and wheels used to transport large amounts of water when a jerry can is too small. Usually used by families or groups on a campsite or during caravanning. Aquaroll is a popular brand associated with camping. These can be refilled and emptied by hand, or used with a pump/filter system.
Found on http://www.gooutdoors.co.uk/glossary

Watercarrier

Those who carry and transport water.
Found on http://www.dandwiki.com/wiki/A_Magical_Medieval_City_Guide_%28DnD_Other%29/
No exact match found