The taste goes in the direction of ClubMate, but has a stronger tea taste than the original ClubMate. I think reasons for that are the reduced amount of sugar and the fact that ClubMate uses natural flavor in their tea extract.
"All things being equal" = that time constant is itself a function of temperature, so lower temperatures slow down (spread out) the process, allowing a broader "balance point" at which to stop the process.
IOW, if you're brewing a hot cup of tea, leaving the bag in an extra few minutes can really increase the bitterness without making it much "darker", but even a few extra hours in the fridge-brewed tea is no big deal.
That version (Club Mate Zero) is hard to get in supermarkets as well, at least where I’m living in Germany. I usually order it online.
Why not do it with the leaves? This is harder as their taste profile is very uneven.
For the sour taste, add citric acid.
I'm pretty sure that if you toy around with the amount of citric acid, sugar & dillution you'll get a similar taste, or something even more palatable for you.
Look for “mate cocido”. La Tranquera is the brand I use.
Edit: My bad, I didn't realise that was for 5 bottles. Carry on.
But nowadays I just drink plain yerba mate with a splash of lemon juice, no added sugar. I do the FreeMate in summer a bit.
Edit: Btw, if anyone of you bought yerba mate before and thought it didn't taste great, for me personally there are huge differences between them. I like the milder ones a lot more that don't have much powder. If you have been disappointed before maybe try again with a different brand and don't forget the splash of lemon juice, that makes a crazy big difference
It took me 4-5 tries to get to a recipe that tastes good. Earlier tries involved cooking the mate, which led to a bitter taste. Cold brewing led to way better results.
Here is my current recipe for 5 bottles (á 0,5l):
The mate tastes less sweet than the original mate, but is still a great drink to keep you awake.[1] Mate tea that I'm using: https://www.amazon.com/Playadito-Traditional-Colonia-Liebig-...