You don't need HEED. If you exercise more than 60 minutes such as cycling, you need a source of energy and food will do the job - sandwich, fruit, energy bar, etc. When you sweat, you need two things - fluid and electrolyte relacement. Just about anything salty like peanuts will do that. It's also a good idea to include potassium from a source like a bananna.

If you like something sweet tasting that's inexpensive, get powered Gatorade and mix a couple bottles to take with you.