Just watched the show,  It's pretty funny... 
Buh.... Tp4 is a bit of an End-Of-The-World enthusiast.. and... 
Why the hell are they NOT living closer to a running water source..
That to me is a huge plot hole....
You just wouldn't do that......
Because you have this "Rational" character, yet he's picked a really bad spot to continue living in.. 
WTF would he farm in arid conditions..