Metromint Spearmint Flavored Water
I purchased this at our local Fresh Thyme market while they were on sale 2 for $3. It does have a clean, refreshing taste of spearmint as advertised with real mint, unsweetened and no calories and if you are not a fan of plain water it might be something you might want to try. but it is a little expensive to have on a daily basis.
You might be able to steep some fresh spearmint in water at home and put it in a pitcher or bottles to DIY your own at home.
To me it seemed to be lacking and tasted much better when I added a few packets of Stevia. I can see using it in cooking some dishes, like rice to add a different dimension, but not something I would purchase on a regular basis.