>>1688436>>1688445Panfish and catfish are easy fish to catch and pretty common throughout the US, I think it would be a reliable food source for a while, but I also wonder in a real mass survival situation if fishing would get a lot harder because so many people would be doing it.
>>1688438Making water drinkable is as easy as boiling it, however if you can't do that for some reason you can actually clean it with iodine drops or a little bleach even.
You can also make a filter out of a plastic bag like in the pic
I've also heard Sawyer filters are pretty good, but I've never used them.