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I always assumed water was just water until this book broke down how mineral content shifts a brew’s acidity and body—now I’m measuring and adjusting my tap supply before every pour. The section on roasting’s interaction with water chemistry alone was worth the price.

The section on how water hardness alters extraction finally made my inconsistent pour-overs click into place. I tested the acidity adjustments with my usual beans the next morning and the difference was immediate, not subtle. This is the rare coffee book that actually changes how you brew.

I read this cover to cover in one sitting, and the section on how water can either amplify or completely erase a coffee’s acidity made me rethink every brew I’ve made. The way it breaks down extraction and body with such clear examples actually changed how I adjust my pour-over. Really glad I grabbe