Answer: I am not familiar with a closed product. Instead of changing your procedures, perhaps you could simply provide some fresh water closer/more convenient to the raccoons and they (and a variety of other critters) would be happy to use that instead.
Alternatively, since raccoons can carry disease and are likely to continue to be destructive to your garden, you might consider contacting animal control and/or fencing them out of your garden.
I'm sorry about your tomato plants!
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