This mostly leaves Rooibus, Coconut water or ignoring the rules. I drink the first few quite a bit, and am slowly exploring the last option.
Just recently, I've come up with a new way to ignore the rules semi-reasonably. Just drinking my favorite iced tea once a week isn't terribly satisfying, but giving myself permission to buy any single utterly gratuitous or random beverage appears to do the trick.
Excessive beverage 1: Cherry Cacao Cocoa Nova - it's basically cocoa minus the milk, and odd but delicious. The brewed/steeped chocolate taste is actually really good. The cherry bit is nice but a little artificial. (I actually kind of like artificial cherry, so opinions might differ here). The mouth feel is unusual or maybe tricky - it's like a hearty tea and your mouth keeps expecting milkfat instead. If I can find the "Mocha" flavor, I'll definitely try it.
Excessive beverage 2: Raspberry Passion Mama Chia - This is like drinking teeny tiny bubble tea, but with seed in it. Also kind of like drinking jello, but in a reasonably good way. The seeds mean you don't really want to actually drink it without a little chewing, but it's surprisingly refreshing in a fruity/hydrating way. I drank this over a couple days, never more than a sip or two at a time, but quite enjoyed it.
Excessive beverage-to-be: One of the many kombucha choices. Frankly, I've always been too intimidated before now, and I'm still a little hesitant now that I've realized it's carbonated and so won't keep once I open it. On the other hand, it's everywhere, I've been curious about how it actually tastes.
Potential beverage of the future: Lychee Wasabi drink. This was the all out weirdest, and I am extremely tempted by it. Maybe next week, especially if I can convince purplebob to help me with it. The side of the bottle suggests "neat" as the spiciest option, and effectively recommends using it as a mixer or watered down. I am deeply curious.