His point seems to be same most other complainer's; our character seems @%$#ed at the lake, unable to pick up water in to the unlimited water jars available everywhere. The phrasing is about jars since that's what the significant change is, but the main point is still the "unable to purify lake water" mechanic suuuucks.
As long as you keep arguing about the "jar simulation", you're never going actually reach anyone who complains about the change, because that's not the logic breaking / conflicting issue at hand. Having a puddle of water you can drink out of, but can't utilize as "water" seems to be.
In case I'm just projecting my own issues, here's how I see it: the OP wants to have "one jar"; that "one jar" would be permanent and allow the work of boiling the lake water to be used for whatever. As long as the jar is permanent, it's essentially the same as having plenty - you'll just have to do your mass production sequentially. His phrasing of the issue points to "having a way to handle natural waters is survival essentials" and yes, that to me sounds exactly the same as "not being able to purify lake water suuuuucks as an idea".