Well, I don't see any problem here.
There are only so many ways to make a bottle top with a wick in it and their design is different from either of yours.
Unless you have a patent on wick based plant watering methods, which I doubt given a google search brings up so many, I don't think you have any grounds to stop this,
It does look pretty similar indeed, at least the idea is the same as yours, but it seems to me that the design is not the same no? (maybe i'm wrong)
It's not easy to protect design even with the Common Creative licenses, i saw a few months ago someone on the french section that found an exact copy of one of his design on alliexpress!
Have you tried contacting the person that created the kickstarter?
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