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I mean, not to tell people how to live their life, but given this shirt lacks a lot of information I'd like to suggest preordering the book he wrote instead. Same gist as the shirt, but he's expanding it to show how to actually draw the owl.

I think a handbook for post apocalypse is a great idea. You may need to do several with different main topics. Subjects like law and farming could (and do) have so much information that they could be books of their own. Depending on the type of apocalyptic event you could also point readers towards other books on more in depth subjects.

How to Invent Everything: A Survival Guide for the Stranded Time Traveler https://www.amazon.com/How-Invent-Everything-Civilization-catastrophes/dp/0753552566/ref=tmm_hrd_swatch_0?_encoding=UTF8&qid=1659029440&sr=1-1

It has a lot of interesting things in it. Maybe it could give you some ideas.

This book is written kind of like that.

How To Invent Everything https://www.amazon.com/dp/0753552566/ref=cm_sw_r_apan_glt_fabc_K3830535M740WBPYJKKW

https://www.amazon.co.uk/dp/0753552566

Quite funny!