Dear Reader, The summer solstice is almost here, but this email won’t be about “half-time” of annual light exposure (if you're above 30º N like in the U.K or most of Europe). But it might be getting hotter where you live and that’s why I’m sending you this comprehensive guide to hydration. If you’re already subscribed to my 12 Golden Rules you’ll already have a good foundation (if you’re not, you can do that here). Today I'm going to build on that foundation. You’ve been told to drink 8 cups...