[Someone more magically-minded than Shaw might have been able to deduce that the cups are the only things that will be able to carry the water, in order for it to keep its intended effects; magic, after all, tends to have rules of its own, if one knows how to look for and understand them. Unfortunately, Shaw knows how to do neither of those things, and she's too logic-minded to find any flaws in this plan. Of course they should just use a bigger bucket. It's obvious.]
Get two, if you can find them. Check the greenhouse.
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Get two, if you can find them. Check the greenhouse.