Heavy alcohol and orbs

While purified water has a weight of just 0,10 per cup, firewater and other alcoholic drinks have 2,5 ? This makes no sense to me. Please check this. Same with orbs. An empty glass flask has 1,2 weight. A full glass flask (with water) has 0,20 weight.

Orbs (all kind of orbs) have a weight of 2,5 per orb. This is way way way too much.

Its for balance purposes, it isnt to make complete sense. Same way a steel foundation can be carried in bulk yet logically it makes no sense. Orbs are a form of seige so it needs the added weight. As far as alcohol idk, maybe they intend to let us toss bottles at players and light them in fire with fire arrows eventually? Would be neat