I mean, it is just water. However, I can totally tell the difference between name brands such as Perrier or San Pellegrino and a store brand.
TJ's ranks very high among store brands, but doesn't quite hold up to the likes of Perrier. Similar to other popular lines of sparkling water, TJ's mineral waters come in different flavors: plain, lemon, lime, berry, and orange. I think my favorites are berry and lime. Sonia likes lemon the best. Orange is our least favorite. But they're all decent, and all worth a try. At $ .89 a bottle, it's not a very big investment.
It's hot out there. You'll surely be sweating a lot. Drink plenty of fluids.
Bottom line: 8 out of 10.