Cycling hydration

Having just read this article on cycling hydration myths, I would say that I learned a lot. Some of the material about how one is, believe it or not, often already partially dehydrated at the start of an afternoon ride I found out with personal experience. Most of the material is more pertinent to athletes and people who are otherwise riding long distances rather than commuters.

With that fact being noted, since we are still in summer, what are some tricks to beat the heat? Is added hydration the key? Do the same rules apply for those going on a walk out in the heat?