Plain water vs Water with Liquid Drops?

Does it really matter if i'm drinking plain water vs. using the liquid flavoring drops within the water?

cdn3.cpnwz.us/.../Crystal-Light-Liquid.jpg

This is what i'm using so far.
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Also I just noticed on my bottle it says: 0 Calories per 1/24 bottle. What does this mean?
Plain water vs Water with Liquid Drops?
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