Many of Snapple's products are not even made with freshly brewed tea leaves. Instead they use instant tea, supplied by Tata Tea, which now owns Tetley. I think the "main" Snapple with lemon is made with brewed tea and says "real brewed tea" or something to that effect in fine print on the label. The Diet Snapple with Lemon does not make any mention of "real brewed tea" on its label. If you don't see that phrase, it was made with instant tea.
Personally, I think all of Snapple's products are horrible anyway and I've never understood how they became so popular.
FWIW, the Lipton Original line (the stuff sold in glass bottles - not the canned stuff or plastic bottled stuff) is the only national brand of ready-to-drink tea made with freshly brewed tea leaves. But I don't really like Lipton Original, either. Like most ready-to-drink teas, it is over-sugared and over-lemoned with hardly any tea taste at all. I only like the iced tea I make myself - strong and unsweetened with a hint of lemon.