No glass after drinking water

It was a change in the last alpha. Drinks no longer return an empty jar and the empty jar item itself has been removed from the game. You can find murky water in loot containers which can then be boiled if your campfire has a pot. You can craft dew collectors which produce clean water over time. You can drink murky water directly from a water source. You can purchase water and other drinks at the trader and from working vending machine. It's all a result of the empty jar item not existing any longer preventing you from crafting jars or using them to gather water.

The community has been polarized by this change for the last year so there is plenty of reading material if you want to search for it.