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Hi,
On this site is a green watering can cake if you scroll down:
http://www.iceit.co.uk/celebration_cakes.php
I would say the handle is made of gumpaste and the spout is probably fondant covered Rice Krispie treats, the spout is set low, to the base of the cake and I think that would be best support wise, stick it with a good dollop of BC, perhaps a dowel or skewer to keep it put?
Hope this helps perhaps s'one else can give some insight also! 
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