The Foxfire magazines are available online to print out and contain all the tutorials for making all the pieces of 1800s and early 1900s tools from scratch, such as hand powered lathes, backyard forges, and so on. There's also How to Invent Everything: A Survival Guide for the Stranded Time Traveler, which teaches everything from philosophy and science to medicine and economics. Practically any super hard-core prepper and survivalist guide will help you too. Depending on the flavor of society you're trying to go for, a copy of your ideal society's manifesto - whether Wealth of Nations or Communist Manifesto - would go a long way to crystallizing theory into practice.
Wealth of Nations isn't really a "society manifesto", at least the 1st book. It goes to great lengths to compare and explain how and why things are valued/priced as they are. Hell, there's even a bit where Adam Smith claims the ideal salary should be twice what a man needs to sustain himself and his family, such that the extra money would be used to acquire more goods or services, thus making the economy grow.
If you're only able to save one book, and you don't know how far its going to collapse back to, I'd go with one that is a practical approach instead of a textbook.
I definitely do not miss Reddit (especially what it became, but notably its descent took many years, only culminating in rather than beginning with the protests), but I would miss Lemmy if it disappeared.
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