Marshall's were a general engineering firm and made absolutely allsorts from steam engines to tea machinery to midget submarines. Its unlikely they subbed out for water carts.
If you look at the picture it shows several Marshall features like the wheels and hub caps which were used on their portables.
If you search on google try water cart within images. It comes up with quite a few, although most are modern there are plenty of the type, just not Marshalls. If you complicate the search by adding Marshall into it, it throws it off into another tangent.
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 It has to be a Marshall...  Even if it's a poorly one again
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