2 doses depending on your admixture. iirc chaliponga needs close to 112 but something like mimosa you could use 56g.
as far as brewing beforehand, i can see how it would be more convenient, but you would have to worry about it succumbing to mold (idk if you could rebrew and it would be still be ok if that happened)
but if you put the steaming-hot brew in a mason jar and then in the fridge i don't know why that wouldn't keep, but i make no assurances.
also the vine should store as long as you keep it in a cool dry place (possibly air-tight if you wanna go the extra mile.
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