I'd think you'd know this, but jars (at least filling them) have been eliminated in this alpha.
Streams, fountains, puddles, lakes, rivers....all contain murky water to drink. You can't take it (maybe with a bucket?), but you can drink it at a risk of dysentery. Vitamins now protect against this, and more seem to drop, so eat some and hydrate up to like 300
Game balance. The need to make survival at least a little challenging. The alternative would have been to carve out a separate encumbrance system for water containers.
-Arch Necromancer Morloc 💀