Considering the surrounding basing materials I wouldn't go with blue, it just doesn't fit. Go with brown or green, if you go brown make sure you make it really deep brown, so that it'll look like muddy water, if you go with green then use just enough to make it look cloudy, moreso toward where the models would be making contact with the floor of the puddle, to represent things getting stirred up, and lighter toward the top.
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