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Have you considered something like http://www.amazon.co.uk/s/?ie=UTF8&keywords=230v+to+12v+transformer&tag=googhydr-21&index=aps&hvadid=11146625100&hvpos=1t1&hvexid=&hvnetw=g&hvrand=626376661980232296&hvpone=&hvptwo=&hvqmt=b&ref=pd_sl_47icadq3v7_b

You would have to remove the existing 12v wiring which would have gone through to the battery and put a cigarette type plug on the end and plug it in, it should work as the water pump does not take many amps, depending on the pump.

You could fit a manual foot pump:

http://www.whalepumps.com/rv/product.aspx?Category_ID=10000&Product_ID=10&FriendlyID=Whale-Babyfoot-Pump-foot-operated

plenty on e-bay around £25

Quote: Originally posted by the black fox on 29/5/2012

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the simplest solution is usually the hardest to think of ,go down to a local scrapyard and locate a sealed battery off a fairly new car ,it will do the job if you top it up regularly from a battery charger ,can't see one costing more than £20 probably a lot less .
its not written anywhere that you MUST use a leisure battery ,i would also advise getting one and not ditching all your 12v lighting in case of campsite power outages ,that happens quite often in my experience

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My water pump runs off 2 6v torch batteries quite nicely,so far for about 6 weeks in total.