Today I was talking to some colleagues from the UK that have been effected by the recent flooding. They mentioned getting water from something called a bowser. Hmm... That's an odd word - the only thing I could think of was Bowzer from Sha Na Na.
It turns out it's a large water tank (e.g. 250 gallons), usually towed behind a truck and able to be left and re-filled if needed. (See Wikipedia too). It seems to originate from Australia and New Zealand, and originally applied to gasoline tanks.
So there you have it.