TL;DR: "Because it's not realistic!"
Don't mind that many other survival games don't give you empty jars either, but you don't really see complaints about that...
The forest? No water jars. Also all the water is either tainted or sea water and you can't drink it. You can after much ado get a pot you can boil water in- But for much of your playthroughs you're going to be subsisting on rain water captured in turtle shells. Seriously, a pro might be able to get that pot right quick; But a newbie isn't.
Raft? No jars!
Water everywhere! Yay! Oh wait no, It's sea water. You can craft a plastic cup to hold it and boil it over a fire.
Project Zomboid: All external water is tainted and needs boiling... Technically no jars you can put water in, but you can use a lot of other containers. And water in PZ is basically a perpetual non issue because even after the water shutoff every water object in the game, ie toilets, sinks, and tubs, have a rese...
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