(Erg... I've got the image of a Blastoise...a Dragon Turtle strapping a couple decanters to its back...maybe using a pressurizing nozzle.)

So the Nature (Water) sphere doesn't seem to have innate ways of generating water, oddly enough. And we're adventuring in the desert, so I don't imagine there's going to be a lot just lying around. But luckily, I am thinking of using a decanter, and the incanter (nature) gains an animal companion, so I don't need to waste the unspecified action of soaking someone, and can just freeze them.

I was going to use this to ask what animal companion would be best for weaponizing decanters, but...since all that we worry about is the strength check, I think that's a moot point. Just take the strongest. But, the question still remains:

Can animal companions use decanters of endless water? And if so, can they use multiple (assuming that they've got some way of holding it, or you strap it on by some contraption)?