First let me say, if you ever get a chance to offer a group of Texans unsweetened green tea, do it; it is an experience. I've never heard green tea, or any tea for that matter, compared to Worcestershire sauce until today, nor have I seen a 50-year-old woman stick her tongue out that far as she shook her head in disgust.
Adagio Anteadote Pure Green tea. A 500 ml bottle retails for $1.79 in my neck of the words or $2 on their website. The ingredients are simple enough, filtered water, green tea, vitamin c. It does not specify what type of green tea is used, though that is no surprise since it is bottled tea after all. It is labeled Product of China, so I assume it is at least Chinese tea.
My impressions: Its kind of pleasant, does not taste over brewed. As bottle teas go, you could do much, much worse. The problem is that the dominant flavor doesn't taste like tea; I don't know it its too much ascorbic acid or what, but it becomes unpleasant after a while.
Ito En Teas' Tea Pure Green. Retails at 2.29 for 500 ml. The ingredients listed are the same. Ito En is a Japanese company, so likewise I assume that they use Japanese tea.
My impressions: It clearly tastes like Japanese tea. I am not as familiar with tea from Japan yet, but I'd guess they're using bancha. There is a subtle roasted flavor. Over all it is too astringent for me to say that its good, but for a bottled tea, it is probably one of the best ones out there. I do like the boldness of the flavor. Other unsweetened teas that I have tried taste watered down, weak, I suspect to compensate for the lack of sugar. Ito En makes no compromises with this one.
Customer's Vote: Ito En: 16 votes. Adagio: 25 votes.
Unfortunately many of the customers who sampled the product did not seem to grasp the idea of a taste test. They'd grab a cup and walk off, so only about 50-60% voted. What was the most interesting about the experience is seeing how different people's pallets are. Most voted for the tea that was strongest, but they couldn't agree on which one that was.
Adagio won the popular vote, but I say go with Ito En. Theirs taste more like tea should, and provide the uninitiated consumer with a better idea of the true flavor of green tea. For more experienced tea drinkers, you probably already know you get better results when you make your own.