The earliest food hack known to man was probably how to purify water. If you didn't know how to make fire, you'd have to MacGuyver some sort of filter for your water to keep that woolly mammoth poop out. Luckily, we've advanced a tad bit since then and have developed some pretty cool filters for water. The Drinkable Book, for example.

Each page of the Drinkable Book acts as a water filtration device. The pages contain microscopic particles of Silver Nitrate, which helps kill about 99 percent of the contaminated bacteria as the water passes through. The pages of the book also contain text that explains basic safety skills (keeping water away from trash and feces) that help maintain a clean water supply. It costs only a few cents to produce each page and an entire book could provide a person with up to 4 years of drinkable water, with each page lasting 30 days.

While this sounds like both a practical and novel product, I can definitely see this become a necessity should (God forbid) the zombies take over. I'll take 10, please.

H/T Ad Week