To be clear: if your plant is Aloe vera (which I would guess it is; see below) this is probably not the aloe you want to be making drinks from.
Whoever told you that story does not understand aloe names as they are understood today. Not just that barbadensis is no longer a valid name (Aloe vera is correct) but that the former Aloe vera chinensis (considered a variety of Aloe vera, in earlier days) is not the same species after all, and it has different uses in cultivation. So whoever gave you the recipe for barbadensis is two steps away from the modern truth (as well as ancient history, as it turns out) about the supposed medicinal/healthy use of the plant.
Aloe vera, the plant used topically for skin problems, makes flowers like this:
Note the color, the shape of the raceme, and the way each individual flower has a little belly on the bottom. If your aloe does not make flowers like this, it is not Aloe vera. Another signature trait of this species is that it is incapable of making viable seed (a result of millennia in cultivation, presumably).
Aloe officinalis, among other species from Arabia/East Africa, is used as medicine that you consume, in contrast to Aloe vera, which you do not. The species name refers to its medicinal use. Its flowers are more likely to be red, orange or coral in color, and they are less densely packed on the raceme. If you want to definitively identify your plant as medicinal, you have to see the flowers.
I do not recommend consuming any aloe that you cannot definitively identify, as there are lots of aloes (500+ species) with no medicinal benefit and even a few that are poisonous (fortunately these are uncommon in cultivation).