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It's a hot summer afternoon. I'm sitting down on a hot afternoon, with a burger, and a cold beer.

What I'm looking for is something to replace that cold beer with. I want it to be crisp and fresh, but also not sweet. I love tart and bitter flavours. Unfortunately, my options are either cold and sweet, cold and alcoholic or hot and non sweet.

So threadiverse, what alternatives am I missing?

Tereré is great, but it's a bit of a pain to source in Australia. What else is there?