If it is a question relating to chemistry, perhaps it assumes ready availability of some chemicals or facilities of testing. Bur if it is a question from common everyday life, I will try to make out the substance from its smell. While water will have no smell, vinegar will have a very distinct smell. Acid will have some kind of acrid smell which I may not recognize very clearly. If some how or the other I had a means of knowing that is is only one of these three options the smell test will be good enough to identify the liquid clearly. But If I do not have these three possible options, things will be more difficult.
But then I will not just stop with the smell test. I will also try to find the source from which the liquid in the puddle has come. Once possible sources have been identified, I will match the smell of liquid in puddle with that in suspected source. If this matches, it will be a confirmation of the original smell test.
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