I knew there was a reason that I hated Lipton...
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Tejava is similarly naked.
I went to a store once looking for a drink other than plain water, and must have looked at twenty bottles of tea, trying to find something that was unsweetened in any way. Honestea used to make one, but I suspect that it got yanked from their production line at some point due to lack of sales.
My Primal Meanderings
I think the deal with wheat, cornstarch, or soy in the tea has to do with anti-caking. To get a good tea you have to dry out the leaves well and then pulverize them (for most tea packets they're just flaked, not whole leaves, which are on a whole nother level of awesome). But anyway, if they're not dried completely or properly you put in some starch to soak up excess moisture and prevent molding. I have no idea if that's completely true or not (thought I'm sure those are used for anti-caking) but it's my best guess.