If you can't hve access to two liters glass bottle, and given that only cold water is used in this basic tek, a plastic bottle can be use too.
Here I have found easily 5 liters HPDE tank, they sell for de-ionised water.
Also, tap water varies ( and is often basic ), for this vinho de jurema I would also use de-ionised water or some good natural spring water.
I see acid would damage juremanine, I do'nt know the perfect pH for this te, but if I were to try it, I would try get some 7 pH neutral water.
This sort of tek can be used for acacia confusa too, or how do they do traditionnaly ?
Also will you take harmalas with it ?
Smell like tea n,n spirit !
Toke the toke, and walk the walk !