I tried the homemade electrolyte drink on my rides this weekend. Following Oakleaf's advice, I upped the salt a little and didn't worry about the potassium, so I wound up using the juice of one lemon (two to three tablespoons) and about 1/16th teaspoon salt in my large water bottle. I added about half a tablespoon of honey, which balanced out the flavors and gave a good mouthfeel.

I really liked it! It tasted great, it was practically free (the lemon was from my tree), and it contained no artificial ingredients. Most importantly, I drank it, so my hydration was better than with plain water. I will definitely be using this for my longer rides.